How do you clean spider droppings that have hardened on vinyl siding. This is on the west side of the house and no dew ever collects on these droppings to soften them. You almost have to scrape them off with a knife. There must be an easier way. I have tried everything from Armour All Vinly siding cleaner and the Clorox vinyl siding cleaning,etc. Any suggestions you can give me will be much appreciated. Thank you much......PS I have sprayed for spiders but at night the street light seems to attract them.