No, you need to use only soap and water. You also need to be using a non-clumping litter - plain old clay, or something like World's Best. Your kitten should not have runny feces - take both her and a fresh stool sample to the vet. She needs to be started on vaccines, and likely wormed and flea treated. Note that a 7 week old kitten is really not old enough to live it's mom and siblings - The age post weaning is when they master litter box skills and learn their "manners" like not biting when playing, and also keeping claws in. She is barely old enough to be using a litter box, let alone know how to jump out without stepping in the waste. Alcohol is toxic when ingested and that is exactly what she will do - lick it off her paws. You need to learn a better coping strategy when you have a pet - they have hairballs, they shed. Sometimes they get sick. And they need vet care and quality food. Call the vet today and get her seen - scoop up some of the poo and put it in a zip-lock baggie to take with you. If you are feeding her a dry food, check the ingredients. Most of them are mostly corn, and cats do NOT digest corn well, and undigested food means stinky poo. Feed her a quality kitten CANNED food with a real meat as the first ingredient - at the grocery stores you can get Fancy Feast Kitten, and Blue Buffalo kitten. Read labels - real meat (not by-products) should be the first ingredient on the list. Proper food also will help with better formed poop. She will learn to cover eventually - but that takes time. Make her vet appointment, feed her the right food, and use only soap and water to clean her up.