I cannot find the original article that says the types affected, but found some examples of some that are:
PETE PVC and PS are resistant, but prolonged exposure will have negative effects. PC is not good with alcohol. PMMA (acrylic) is not good with alcohol according to most sources other than personal experience.

If you spray a plastic and there is a 'film' or 'residue' left after wards (something I have seen many times) that is "leaching the plasticiser out of the plastic piece." the best example is the film on car windows that develops as the sun causes the dash to break down. The ineviatble cracking is the result, so same thing (cracking) will be the result of use on affected plastics.
This film is what I meant as the reason for letting dry and cleaning once more with water, you are cleaning that off, but further it is a sign the alcohol negatively reacted with plastic.
I don't think it does. I think you're thinking of ammonia which is hard on acrylic plastics because it can cause the material to shrink and crack. Alcohol is actually a recommended cleaner of polycarbonate plastics.
I was thinking of alcohol on acrylic. I work with it alot. Just google "alcohol and acrylic plastic"

All this info and more can be found on a Google Search. I'ld post links to some I found, but dunno that BP.net wants outside links posted, so you will have to check for yourself.