paintwork

Hi, ive had apx 18 skodas and wont buy any other make. Currently ive got a silver leaf colour citigo which has white patches appearing on certain parts of the bodywork we have investigated this to be told some sun creams etc to which we dont use. It's coincidental that a silver octavia had had the same problems and my friend has a silver car and she's got them too, never again am i going to have a silver car again im hoping to change this car in apx 6 mths time and it won't be silver. Wondering if other people have had similar problems