What are you getting the grease off of?
If it is not a painted item, like maybe an engine part, RAVE valve, etc, I use GunScrubber. It is almost like compressed acetone in a can. But it will take paint right off and pretty sure it melts rubber and plastic.
I use a VERY brief rub of lacquer thinner to clean grease off my vinyl seats. Again, it eats the vinyl, so I just damp a rag, and wipe it quickly then wash off with soapy water. Lacquer thinner also melts fiberglass so if you use it, do the same as for the vinyl. Use it only in emergency and clean it off quickly.
If you remember from high school chemistry class, "like dissolves like" and fiberglass, vinyl, and grease are all petroleum distillates, and whatever dissolves grease will likely also dissolve paints, fiberglass, vinyl, and plastic.
Chlorine bleach products are pretty good for cleaning grease off of vinyl without damaging the vinyl.
Then for hands, I use gojo without the grit that I have a dispenser for in my garage. First I dump a light dusting of borax powder into my hand for grit, and then 2 pumps of the gojo, and no grease or grime is left.
It all depends on what exactly you are cleaning.