I mixed 3 oz in a spray bottle to try it out on the siding. Sprayed it on and let it soak about 30 seconds and they wipe right off (fantastic). The black spider spots come off with a little more rubbing but they are all gone. Glad I looked around on the internet and found your product. Next I will try to wash the dirty work clothes that never seem to come clean.
~ Larry Pierce, Onalaska, WI