comp

Lets see a picture

i'll have to get the wife to do that lol lol

You mean like removing sap? Removing sap is really tough and usually requires something like goof off.

sap and a mold looking stuff,,, it sticks to rain-x on glass

When I am getting ready the detail a car and I want to remove all of the old wax/sealant/road grime/etc., instead of Dawn, I will use a strong concentration of a citrus wash which is just a pure wash, it has no conditioners or anything in it so all you have is a really clean surface to start claying. There are a few companies which made such a wash.

how does it work on cars that are parked under tree's for long periods ??