|
This looks like a case of "crazing." I've attached a little info about crazing, I'll work on finding more. really there is nothing that can be done about the current condition; I don't know if BMW has changed suppliers or mfr procedures to help mitigate this in future vehicles. Unfortunately almost any way you go this can happen, it may happen to one vehicle and not another, it could happen to a batch of vehicles and not the next, this sort of problem is unpredictable and is induced by MANY different things; from the previously mentioned cleaning agents (although that would be more on the outside) to heat and moisture and even the materials that make up the lens.
|