SirMike1983
Riding a '38 Autocycle Deluxe
I try washing them first. I've used Dawn Power Wash, Simple Green, Formula 409, or even regular dish soap and warm water. Any of those will get the dirt.
If the grips are still too dirty or are badly stained, then I resort to something like Goof Off, alcohol, or mineral spirits. When you use these, you are actually removing the outermost layer of the grip material to get to cleaner material below. It should be done sparingly with a rag and not soaked in these solvents, which will melt the grip material if you let it.
I've also tried the Wintergreen Oil-Alcohol mixture you sometimes see recommended, but I wasn't a fan of it. It smells good but is toxic and can melt the outermost layer of grip material quickly.
If the grips are still too dirty or are badly stained, then I resort to something like Goof Off, alcohol, or mineral spirits. When you use these, you are actually removing the outermost layer of the grip material to get to cleaner material below. It should be done sparingly with a rag and not soaked in these solvents, which will melt the grip material if you let it.
I've also tried the Wintergreen Oil-Alcohol mixture you sometimes see recommended, but I wasn't a fan of it. It smells good but is toxic and can melt the outermost layer of grip material quickly.