Ohhh ok. So I'm better off painting over them then
Yes, but that is not optimal. You could try Lye-based stripper like Castro Super Clean or EasyOff Oven cleaner (the original formula). There are several different stripping solutions modelers use, Isopropanol is not the only choice.
Then there is also Testors ELO, but I had some issues with it reacting with the plastic Kato uses.