Chlorhydric Acid does not interact at all with the ABS used for Lego parts : I use it to clean up vintage Pat. Pending parts when it's necessary. It may dissolve the unwanted decorations... Adults only of course, it's REALLY dangerous to handle.
Great, great cars : I'm going to study them one by one for sure!
These things took me a couple attempts Sven. I tried to chuck them in a tin of petrol first. Good idea in theory, but after half an hour the parts dissolve. Oops. Ten minutes max, then wash them in soap and water it kind of works.
Yeah i agree totally with the decorated pieces. The pieces itself are very nice but it's a mess to get the decorations of it. Hard work which was worth it because the car looks great ;) . I used nail enamel remover for a minifig torso. Needed nearly half an hour to get the paint off it. But it worked and it doesn't harmed the piece itself.
I should add a ps. on this one. If Mr. Lego is by any chance reading this, please do not paint smiley faces on these things. Just include a bunch of stickers which I can throw in the bin.
Nice parts, but I could do without soaking them in gasoline for an hour to get the paint off. Then spraying them with polish and rubbing them with a cloth to get the shine back.