Paint and brush cleaner is simply 'solvents' and 'mineral spirits' / 'paint thinner'.Chuck is right. ACE used to make their own brand, but now carry some non-ACE generic name. Ask for paint brush & roller cleaner. Pretend you really need to clean brushes and rollers!
Mineral Spirits / paint thinner is simply a lighter fraction of OIL ... could be considered #1 oil, diesel oil is #2 OIL.