It's all about chemistry class.
a. Acetone is not an all purpose solvent. Know what you are removing.
b. Chemical compatibility. Google
this for the solvent and the material. If you do not know the material, test in a corner. For example, is it Plexiglass (trade name for acrylic
or PMMA) or polycarbonate (also PC, trade
name is Lexan).
In this case, mineral spirits is a good choice, but other similar suggestions will work
The term "thinners" is too generic to be meaningful. Could be water
, paraffin solvent, aromatic solvent, ketones, or even esters.