Is the poor bugger totally soaked? If so, get professional help, like Sorcha said, their memories are loooooong.If it's just a little spot, use Dawn or even Tide laundry detergent (Tide works great on cows with bloat too...I buy it by the case..)
Before using ANYTHING, check for labels. If it's not safe for children, it's not safe for critters. And for your cat's sake RINSE, RINSE, RINSE....ingestion of the cleaners can be as detrimental to their health as the ingestion of the oil.
Don't use the alcohol again if you can help it, and pet-proof your garage as well as your house. The fur-people can be as bad as kids when it comes to getting into things.
PM me if you have any other questions,
~Elle (thanks Micca for the heads-up)