You might try washing up liquid first then the stuff that goes into a dishwasher.

Try Oven cleaner!

I had old stains and used bleach mixed w/dish detergent and peroxide. It worked very well except for the oil stain caused by my citronella candle.

myritic acid (did i spell that right) cleans it right up

debbie

myric sp? acid cleans it? OH YIPEEEEE! I thought I was going to have to look at all those huge oil stains on my carport for the rest of my life!!! Man I hope this works for mine!!!! my daughters car leaks like a sifter and no one can get the thing stopped! I started putting cardboard under her car to keep it from making my floor look worse!