I used Goof Off to remove bicycle chain grease on a pair of DH kakis, and it worked like a charm. There wasn't a trace of the black grease or a shadow ring left by the Goof Off. I had washed the pants at least three times before this, pretreating with everything that I had; nothing worked. I thought "These are ruined, so Goof Off couldn't make them worse." Wow! I am pleased that I took a chance and used it.