Before any water runs, triage decides whether this is a bath at home or a trip to the vet. Keep her contained and stop her grooming the coat while you think, because what is on her fur becomes what she swallows the moment she starts licking. Send her to a vet before any bath in three situations: she may already have licked a good deal of the oil, you cannot identify what the substance is, or it could be antifreeze or a solvent. Antifreeze is dangerous to cats in very small amounts, and a cat who may have swallowed any of it is an emergency, not a grooming problem. Solvents themselves are never used on a cat — no turpentine, no gasoline, no paint thinner on her coat, however well they cut grease on metal. A plain oil or grease smear from an engine sump or a garage floor, on a cat who has not been grooming it, is the case you can wash at home.
The Wash: Dish Soap Is the Degreaser
Ordinary cat shampoo is not built for this job; plain dish soap is the degreaser that actually shifts oil and grease, used in a small amount and worked through the greasy patches rather than lathered over her whole body. Set up first: a warm room, a sink or tub with a non-slip surface under her feet, lukewarm water tested on your wrist, towels within reach, and the dish soap open before she is in the room. Wet the greasy areas, then massage a little dish soap into the worst patches with your fingers, letting it sit briefly so it can break the grease down before rinsing. Rinse thoroughly in lukewarm water — soap residue left in the coat gives her something else to lick and can irritate skin. Repeat the soap only where grease remains, rather than starting the whole wash over, and keep sessions short: a cat who is coping for five minutes may be frantic at ten. If she panics, stop, wrap her in a towel, and let her calm down completely before deciding whether a second short session is fair to her.
Warmth, Drying, and Watching Her Afterward
A wet cat chills quickly, and a cat who was hiding under a car may already be cold and shaken, so drying is part of the treatment rather than an afterthought. Wrap her in a warm towel straight out of the water, then dry her thoroughly in a warm, draft-free room, using a fresh dry towel as the first one soaks through. Keep her indoors and watch her for the rest of the day: renewed grooming at one stubborn patch, drooling, vomiting, loss of appetite, or unusual sleepiness after the bath all earn a call to the vet, because they may mean she swallowed more of the substance than you saw. Note what the substance likely was and how much coat it covered while the details are fresh.
Two People, Assigned Roles
A greasy, frightened cat is a two-person job whenever a second person is available, and it goes far better when the roles are settled before she is picked up: one person holds and steadies her and watches her stress level, the other washes, rinses, and handles towels and warm water. That division of labor is a small household plan, and it is what the Care Teams feature in KinsLe holds for bigger care jobs as well — named people, named duties, written down instead of negotiated mid-bath with a wet cat in someone's arms. Agree in advance who calls the stop if she panics, and where she goes to recover afterward: a warm, quiet room with water, a litter tray, and no audience. Handled this way, most plain grease comes out in one or two short sessions, and she forgives the indignity quickly. Back home, the session notes sit in KinsLe beside the Care Teams assignments — who held, who washed, what the coat still needed — so a second session starts from a record instead of guesswork.