Ugh! How can I clean spider droppings off my house and railings?

We use our front porch constantly in the summer. There are spider webs all over. I have tried without success to prevent them from coming back after taking them down. I know spiders are useful, but not on our porch and the droppings they leave all over the light colored vinyl siding and white PVC railings looks terrible and are impossible to clean. Even soft scrub with bleach and the power washer don't take it off. Any suggestions on how to prevent the spiders from coming back and how to clean the droppings would greatly be appreciated. Thanks

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