<https://olivertraveltrailers.com/forums/topic/2815-need-help-on-cleaning-exterior-window-039band039-amp/#comment-26657>
<http://schema.org/text>
"Gwenne - \n  \n\nJust the other day I was cleaning some tree sap off the fiberglass with plain old mineral spirits.  I tried some on a small spot of white caulk that was used to seal my windows and it worked wonderfully well with very little rubbing.  I had previously used Acetone but I was always afraid that this was simply too aggressive.  It looks to me from your pictures that you have a bit of mildew, so, I'm not sure if the mineral spirits will work.  But it is worth a try.  Good luck! \n  \n\nBill \n"
<https://olivertraveltrailers.com/forums/topic/2815-need-help-on-cleaning-exterior-window-039band039-amp/>