i use Fizzion.. it works great!!!! ive tried all the pet stain products out there, even natures miracle and it did not work for me either. Other products left a white soapy residue stain on my carpet. Fizzion also got out the old stains the other products left behind. There is a YT member on here that sells it. If u do a search on Fizzion on YT, u should find it.
FiZZiON Concentrated Cleaner, Carpet Stain Remover, Pet Stain, Odor Remover, Stain Cleaner
Good Luck!