I used it on enamel too! I thought it would take forever but it was pretty quick! I always thought commercial paint was die-hard, but Pine Sol kicked it's butt! I don't know how it does on acrylic, maybe I could stick an old paint-laden Tamiya paint bottle in someday.
The plastic (ABS for you Valk modders out there) was un-scasthed! An added bonus, it was pine fresh - MT