Lately when I help somebody wash their car we always ask, what is this sticky yellow substance?!?! birdshit?? NO. Tree Sap?? NO. Does anybody know if this sticky yellow crap that sticks on cars is linked to the chemtrails from those stupid airplanes I see all the time in the Valley???(San Francisco, CA). What can we do to protect ourselves from this?Anything else besides wearing a gas mask or goi…