car care

[vj232]

I need some help guys, i bought my car from someone who had the 240 sitting outside for about a month, because of their lack of money for insurace. This was about 1 month prior to winter. The problem is is sat in the rain and when i bougth it i cleaned it before i stored it for the winter, but now when i look at it in the right light even after washing it i see were the raindroplets use to be on the some parts of the car and on the windows especailly. The car is black and i would like any suggestions as to how to get the residue off. I have tried many types of cleaners on the windows and but with no success.

Any help would be appreciated

thanks