What gets me are those spiders that drop down on a thread from the corner, leaving that little sac of eggs behind, and then get squeegied all over the window.
They always leave a smear.
Then you use the scrim to get the little sac thing out the corner of the window and you can't get it off the cloth so you flick it off and it sticks to your fingers.
Then when you get in the van you find it stuck to your jumper.
Don't know about wfp and getting rid of them, afterall, wfp removes everything off the window better than trad methods. When I use wfp I don't check anything as it works 100% perfect everytime. :