I used to use cellulose thinners (for spray painting cars) which will dissolve plastics and is also a good airbrush cleaner of last resort if your seals will stand it. Dettol is much more user friendly though do not let it dry out!
However Dettol will not strip everything, some paint jobs seem resistant to it, so in to the cellulose thinners they go; so there is a place for both.
I still have some proper old fashioned paint stripper that I should use before it eats its way through the bottom of the tin but I am a bit wary of it, if you leave it you just get gunk.