Alcohol rubbed on carpet using white paper towels (no colors) has removed rust stains, coffee stains, and pet stains containing multi-colors from food. My husband dropped a glass of purple grape juice on a light gray carpet. I immediately blotted it up with white paper towels to remove liquid. I applied pressure to get up the rest, then I used alcohol and white paper towels. It completely disappeared!
Source: I saw a carpet cleaner remove rust stains from a light grey carpet using this method
By Lucy from Marathon, FL
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Straight rubbing alcohol will remove any stain from your carpet. It does not discolor the carpet and will remove poo, pee, pink sticky stuff, absolutely anything.
Always keep a bottle of rubbing alcohol (very cheap). When you get a stain or spot on your carpet, dip a toothbrush in the alcohol and rub it out.