i got black chain grease all over the back seat of my friend's car when we squeezed my bike in there. in our haste, we weren't careful and we literally dragged the chain on the fabric for about 2 feet on the seat. my friend was horrified. but i tried this stuff my girlfriend picked up from the local duane reade called 'stain-z-out.' poured it right on, let it soak, then wiped it off with a paper towel. large chain grease smear COMPLETELY gone! i used it on some of my pants cuffs too where there were some grease stains. just put some on before i stuck it in the wash. those came completely out too. stuff is amazing.
the bottle says 'as seen on tv' so i guess they have an infomercial running, but i've never seen it.