if the can of solvent didnt have a warning not to use it on plastics you can do the american thing and sue them. <LOL>
I would love to but I am in a developing world country and I doubt it is worth doing anything about it as the company is a local one.
Having said that, I dabbed some WD-40 on it last night and it the "freeze burn" has much improved i.e. the white parts seem to have disappeared for now, however, I don't know if the freeze burn stains will come back or if the WD-40 has finally done the trick...