Rug grease spots. you cannot hide them with your furniture!
Especially, if they are in the center of your living room.
I tried many professional products.
Nothing worked. I had two very obvious grease stains on my WHITE carpet. When they got darker and darker from dampness, I was jsut about to buy new carpet.
DON'T DO IT UNTIL YOU TRY THIS!
I had nothing to lose-try it on a small area 1st. Isopropryl (rubbing alcohol) poured directly onto the area...or sprayed onto it. Let it sit only for a few minutes. Then, take a dampened sponge with a scouring pad side amd rub firmly against the carpet's grain.
I now do not have stains and do not need to buy new carpet.