Let the grease set before you throw it
Hot fat never goes down the sink, soap or no soap. Pour it into a can, let it harden, bin it — or strain it and cook with it. Both camps are here.
Built from people describing what they do with the fat in the pan — the can by the stove, the foil bowl, the jar in the fridge door, and the clogged drain that taught them — with the soap myth checked against plumbing guidance and the dog warning against veterinary advice.
The pan is cooling and there’s a puddle of fat in it. The sink is right there, the tap runs hot, and there’s a bottle of dish soap on the side. The people behind this page have poured it down that sink, and learned the thing this page exists to say.
Never pour fat down the sink, even with hot water and soap. Let it cool, pour it into an empty can, a jar or a foil-lined bowl, let it go solid, and bin it — or, if it’s bacon or beef fat, strain it into a jar, keep it in the fridge, and cook with it.
Ten separate conversations say the drain is the mistake, and nine warnings agree. Fat that runs liquid out of the pan sets solid in the pipe an hour later, in a place you can’t reach, and the soap trick three conversations swear by is corrected inside those same conversations: soap surrounds fat, it doesn’t dissolve it, and hot water carries the grease further along before it hardens. You’ve moved the clog. Thirteen conversations do the plain thing instead: a can by the stove, fat poured in once it’s stopped spitting, left to set, binned when full. Seven line a bowl with foil and lift out the parcel.
Fifteen conversations go the other way and keep it — bacon fat and beef fat are cooking fat, the same thing you’d buy in a tub — and six accounts say throw it away and don’t look back. That argument is laid out at the bottom of the page with both sides, because the answer is whether you’ll cook with it, and only you know that.
The first question below is the drain and the soap myth, with the can and the foil and the flour. The second is keeping it: how to strain it, why the bits and not the fat are what spoil, and the frying-oil exception. The third is the bin, the compost heap, the birds, and what to do with a fryer’s worth.
Who this page is not for: anyone hoping the dog will take care of it — the safety line above says why not. Anyone on a septic tank or old shared pipes looking for the amount that’s safe to pour; there isn’t one. Anyone with a home compost heap wondering if fat goes in; it doesn’t. And anyone whose real question is whether to eat the bacon, which the people here argue about and this page leaves alone.
The far side is a can on the counter that fills slowly, a drain that never gets mentioned, and, in the fridge door, if you’re that sort of cook, a jar that makes tomorrow’s eggs taste of today’s breakfast.
The community disagrees on this one
The argument people have over the cooling pan: is that fat rubbish, or an ingredient?
Bin it — set it in a can and throw it away
This side wants the fat gone and the kitchen clear. Their case is that a jar of grease on the counter is clutter that goes rancid, that they'd rather not have jars of grease lying around, that saving it invites the pests the cautions here describe, and that the whole point of the can is to get the fat out of the sink and out of the house with the least fuss. Set it, bin it, done.
8 independent accounts
Keep it — strain it and cook with it
This side sees free lard and won't waste it. Their case is that rendered bacon or beef fat is the same thing sold in a tub at the shop, that eggs, potatoes, gravy and a cast-iron pan are all better for it, that a strained jar with a lid keeps well in the fridge, and that throwing away something you'd otherwise buy is the mess, not the jar.
6 independent accounts
The argument names its own decider: whether you'll actually cook with it. If yes, strain it and keep it cold; if no, set it and bin it. Both sides agree on the two things that aren't preferences — nothing goes down the drain, and the dog gets none of it — and both agree that the fat has to be solid before it goes anywhere.
Common questions
Why can't it go down the sink — and doesn't hot water and soap fix that?
Because it sets, and no, and this is a myth the people here correct at length. Across ten separate conversations, and nine of the warnings attached to them: liquid fat poured down a drain cools inside the pipe and turns solid, exactly as it does in the pan — and it does that where you can't reach it, on the bends of your own pipes first and then in the shared sewer, where one account explains it joins the mass of fat that cities call a fatberg — a public infrastructure problem and cost, not a private one. Coconut oil and animal fats set at room temperature, one caution notes, but the rule covers cooking oil too. The soap trick, from three conversations: mix the grease with dish soap and hot water and it'll go through 'like the dishwasher does'. One correction inside those same conversations takes it apart, and plumbing guidance agrees: soap surrounds fat, it doesn't dissolve it, and hot water only carries the grease further down the line before it cools and sets there — you've moved the clog, not prevented it. So: never down the drain, with or without soap. What instead, from thirteen separate conversations and a long run of single accounts: a vessel. An empty tin can, a jar you've finished, a mug you don't love, kept by the stove; pour the fat in once it's cooled from spitting hot, let it set on the counter or in the fridge, and when the can is full, lid it and bin it. Thirteen conversations add the same second rule: let it go solid before you move it, because a solid puck comes out clean and a warm liquid ends up everywhere. Seven conversations use a variation: line a bowl with foil, pour the fat in, let it set, then lift the whole foil parcel out and bin it, leaving a clean bowl — one person cuts the foil much bigger than the bowl so the drips down the side are caught too. Two conversations and three objections call the foil wasteful when an old can does the same job; the people who use it answer that it saves washing a greasy bowl. Either works; the rule is the can, not the foil. One person mixes the liquid fat with flour into a dry ball and bins that; an argument here runs three against three on whether that's clever or fussy. If you'd rather not have a fat can on the counter, one caution says grease left out overnight draws gnats and bugs, and several people put the can in the fridge or freezer instead — where it sets in an hour or two.
Should I keep it? Bacon fat, beef fat, the oil from frying?
Fifteen separate conversations say keep the animal fat, and the argument about that is laid out at the bottom of the page with both sides, because eight separate accounts say throw it away and mean it. Here is the case for keeping. Rendered bacon fat and beef fat are cooking fat — the same thing you'd buy as lard or dripping — and the people who save them fry eggs and potatoes in it, start a roux or a gravy with it, roast vegetables in it, rub it on a cast-iron pan, and one bakes with it. A dozen single accounts describe a jar or bowl, sieved of crumbs and kept in the fridge if it won't be used soon. Two rules from the people who do it well: strain it. Pour the warm fat through a sieve or a coffee filter into the jar, because the fat itself keeps — one correction here explains that pure fat has no water for bacteria to grow in, and what turns a jar rancid is air and light, and what turns it bad is the bits of meat left in it. So strain out the bits, keep the lid on, keep it out of the sun, and the fridge is the cautious place for a jar you won't use soon; how long it keeps isn't settled here; one argument here is between people who keep it on the counter and use it up fast and people who've smelled a rancid jar, and both are right about their own kitchens. How long it keeps is a question the people here ask and don't answer, so this page won't either; your nose will. Two conversations disagree about bacon fat as a frying fat — one side says it burns, the other says that's what makes it wrong for a hot pan and right for a roux or for spreading on bread — and the decider is the heat you're using. Frying oil is different: it can be strained and reused a few times for the same kind of frying, but it's not a keeper the way rendered fat is, and the volume is usually the problem — see the next question. Two smaller things people here do: cook the bacon on a rack in the oven so the fat drips into a tray, then wash rack and tray like any cookware; and, for the frugal, one person uses stale bread or a tortilla to wipe the pan and eats it. And one correction to carry: fat isn't cholesterol, and the health argument in these conversations about whether to eat bacon at all is a different page — this one is about the fat that's already in the pan.
What about the bin, the compost, the birds, and a lot of oil?
The bin, once it's set, is the honest answer for an ordinary household, and it's what thirteen conversations do. One objection here notes that oil in landfill isn't nothing — it can leach — and offers the alternatives below; this page's reading is that it is still better than the sewer. Paper towels: two conversations soak up small amounts and bin the towel, and single accounts use whatever's already destined for the bin — newspaper, a cereal box, a paper bag, junk mail, bread ends — with one caution not to put inked paper against food you'll eat. Cloth is the wrong tool: an argument here settles that a greasy cloth is hard to wash clean, and one caution describes thick grease from laundry setting in the drain. Compost: not the home heap. Three conversations and a correction say animal fat in a garden compost bin draws rats, raccoons and maggots and goes off rather than breaking down; two conversations say a council food-waste or green-bin collection often does take it — check what yours accepts, and let it set first so it doesn't run. Birds: two conversations, and two more, make winter suet by mixing fat with seed, peanut butter and flour. It works, and it's argued: three accounts warn that a fat cake also feeds rats, raccoons and skunks, one questions whether salty bacon fat should go to birds at all, and cooked grease with seasoning in it isn't clean fat. If you do it, use plain rendered fat, hang it high, and take it in when the weather warms. A lot of oil — a deep-fryer's worth — is the case the ordinary methods don't fit, and the people here name it as a gap; two single accounts point to the answer that exists in some towns: a household-waste site or a utility scheme that collects used cooking oil for recycling into fuel. Search your local council, city or water company's name with 'cooking oil' and you may find it. And one account turns old fat into something else entirely — fire-starters, by pouring it over old t-shirts in a cardboard box for firestarters, or around a wick for a scented candle — which is clever if you have the habit and pointless if you don't.
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