Cats wash themselves with great dedication, which is why a cat who comes in smelling of something dreadful has usually found a substance grooming cannot shift — fox mess, something oily, garden waste, the contents of a bin. Your cat's tongue will spread it further, so doing nothing is not neutral — but neither is a full bath automatic.
First, Work Out What You Are Dealing With
Look before you wash. Where is the substance — one flank, the neck and shoulders where cats press and roll, the paws that walked through it? And what is it, as far as you can tell? If you cannot identify it, or it smells chemical, oily in a petroleum way, or like a garden or household product, phone your vet before any washing. Some substances should not be spread over more skin with water, some need specific handling, and a cat who has already licked a harmful substance needs advice promptly rather than a bath first and a phone call after. The vet will also tell you if your cat should simply be seen. A known, ordinary stink — animal mess, mud, something rotten from the garden — is the case the rest of this clean-up covers.
Start Small: The Targeted Clean
For a localised mess, clean only the affected area. A cloth dampened with lukewarm water shifts more than owners expect, and working in short spells lets your cat stay in charge of the encounter. For a stubborn patch, wet that area alone over a basin or in the sink, work in a small amount of a wash made for cats, and rinse that patch until the water runs clean. Never use a wash made for dogs on a cat, and never a human shampoo in a pinch; cats groom whatever stays in the coat, so only cat-appropriate products belong there. Clip out a small matted knot of contaminated fur rather than soaking and pulling at it.
The Full Bath, as a Fallback, Done Gently
If the substance covers most of the coat, a bath becomes the kinder option than an hour of piecemeal wiping. Prepare everything first: a towel on the base of the bath or a large sink for grip, lukewarm water run shallow, a few inches at most, the cat wash open, and towels ready for the end, because a wet cat waiting while you fetch things is a cat deciding to leave. Lower your cat in steadily, keep one hand on them throughout, and wet the coat with a jug rather than a shower head, whose noise and spray unravel many cats. Wash quickly and quietly, skip the head entirely, and rinse until no residue remains, since anything left will be licked off later. Lift your cat straight into a towel, dry thoroughly in a warm room, and allow a dignified retreat afterwards with food and no further handling.
Two people help for a known battler, and stopping partway is legitimate: a half-clean, calm cat can be finished later.
Afterwards: Watch, Do Not Just Sniff
Once clean, keep an eye on your cat's skin where the substance sat, and on appetite and litter habits over the next day, because the licking that happened before you intervened is the part you cannot undo. Reddened skin, drooling, unusual quietness or repeated sickness after contact with an unknown substance are reasons to phone the vet that day rather than watch and wait. Deal with the source if it was in your garden, since cats revisit a good rolling spot. Afterwards, write down what shifted the smell and your cat's tolerance of each stage, because within KinsLe the household Care Teams log gives that dated account a shared home, sparing the next helper from guessing which approach worked.