I used to do a lot of this with the ABS shells, oven cleaner, caustic soda and brake fluid were my main weapons. But I never did a lexan shell - I got one in a trade that had been done with something, possibly brake cleaner, and it was cloudy.. it was a scorpion shell without windows so it didn't matter as the paint didn't show up the cloudyness but if you are doing a shell with a window its worth keeping in mind that the windows might be cloudy.
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