When removing stains from synthetic carpet, the ingriedients in the cleaning solution are less important than the color. Blue window cleaner mixed with any type of fruit eating mammals blood is best for grape juice. Horse urine (and the urine of most ungulates) has been known to remove tar staining from caused by the smoke from american cigarrettes. (Orange juice stains are tricky as the brand name of the product used must also rhyme with "orange.")