I'm sorry I didn't check this posting sooner, and I really don't know if this would have been any help, but when it comes to pine sap - and I know you said it was overspray that only 'looked' like pine sap - I use RainX. RainX dissolves pine sap on contact. I couldn't help wondering if it would have taken off the overspray as well. I use RainX on the paint as well as the glass and cladding, then wipe thoroughly afterwards...for pine sap.