If you shower and still smell

First, the part that is not about you.

The smell is not the sweat. Sweat is close to odourless when it arrives. What produces the smell is bacteria on your skin breaking down what the sweat softens — and what it softens is keratin, which is the dead skin sitting on the surface.

That is why a shower can genuinely fail. Soap and water lift what is loose. They do not reach bacteria living in and under a layer of dead skin and in blocked pores, and they do not remove that layer. You can wash daily, correctly, and leave the actual source in place.

There is even a name for odour that persists through ordinary washing and deodorant — bromhidrosis. It is a recognised thing rather than a personal failing, and it is worth knowing that before you read anything else here.

Washing is not reaching where the smell is made, so the answer is to get at the dead skin, cut the sweat supply, and check your clothes.

Tonight

If you need something to work in the next ten minutes, alcohol is what people used: hand sanitizer, rubbing alcohol, an alcohol wipe, wiped on and allowed to dry. It kills the bacteria that are there now, and the effect is immediate.

Treat that as an emergency measure rather than a routine. The people who used it every day ran into the other side of it — alcohol strips the skin barrier and the harmless bacteria along with the rest, and dryness and irritation follow. As a fix before an interview or on a day with no shower, it is well accepted. As a daily habit it is trading one problem for another.

Also, and this is the correction the conversation made to its own most popular tip: killing the bacteria does nothing about the sweat that feeds them. They come back. Which is why the real work is in the next section and this one is just a bridge.

The fortnight that actually changes it

Three things, and none of them is a purchase you have to make twice.

Exfoliate the area, gently. This is the step that follows from the mechanism: you are removing the dead skin the bacteria feed on. A washcloth or a soft brush is enough; if you want the chemical version, salicylic acid or glycolic acid does it without scrubbing. Not straight after shaving, and not hard.

Use an antiperspirant, at night, on dry skin. This is the one most people get wrong, and the reasons are specific rather than fussy. Antiperspirant works by aluminium salts forming a plug in the sweat duct. The salts cannot get into a duct that is actively pushing sweat out, and if the skin is damp the product is diluted below the strength it needs. At night you are sweating least and your skin is dry, so it has hours to work. And the plug takes something like ten days of use to build properly — so if you have ever tried an antiperspirant for two mornings and decided it did nothing, you did not fail, you stopped before the mechanism started.

Note that deodorant and antiperspirant are different products. One masks; one reduces the sweat. Plenty of people using a “deodorant” faithfully have never used an antiperspirant at all.

Wash the clothes properly, and suspect them. This is the one that surprises people who are doing everything else right. Odour lodges in fabric fibres and survives a normal wash, so a clean body goes into a shirt that reintroduces the smell within the hour. If your clothes smell faintly of it when dry, that is your answer. White vinegar in the rinse strips it; so does making sure things dry fully rather than sitting damp in a machine.

If you want to go further on the wash itself, an antibacterial or antiseptic body wash — chlorhexidine, or a benzoyl peroxide wash — kills more of the specific bacteria than ordinary soap does. Lather, rinse properly, and read the caution at the top of this page before you use either.

If none of that works

Then it is worth stopping the experiments and asking somebody.

A few ordinary things change how sweat smells and are worth ruling out first: garlic, onion, curry, alcohol, and some medicines will all come through the skin. If the smell arrived at the same time as a new prescription, that is worth mentioning to whoever prescribed it.

Two things this page deliberately does not give you, because it cannot. It names no strengths or dilutions for any of the products above — what percentage of salicylic acid, how dilute a chlorhexidine wash should be, how often is too often. Those questions were asked repeatedly and the answers people gave each other did not agree, and a wrong number on a chemical you are putting on thin skin is worse than no number. Read the label, start with the weakest version, and use it less often than you think you need to. It also names no products and no prices, so if cost is the constraint, the free half of this page is the exfoliation, the clothes, and the timing.

Beyond that, persistent odour that does not respond to any of this is something a doctor can help with, and the specialist is a dermatologist. There are treatments beyond anything a supermarket sells, and the threshold for going is not “it is unbearable” — it is that it is affecting your life. Asking about it is a reasonable thing to ask about, and the person you ask has heard it before.