How to keep squirrels off house and screens?

dogs and cats are the best answer. Squirrel will avoid dogs and cats like the plague. If you don’t want pets you may want to purchase a pest repellent. Sprinkle around the house after every rain and soon they will avoid your house

Buy some red fox urine and a spayer and spray the trucks of trees and your attic!

Not true...the squirrels in my area come right onto the porch with my dogs going nuts through the glass door. They couldn't care less.

I had the same problem. I found that spreading urine from a predator didn't work if that predator isn't in your neck of the woods. I used all types of repellant and it got expensive because it rained a lot. Get yourself a couple of live traps and a jar of crunchy peanut butter for bait and watch your traps fill up. You then can do with them whatever you want. The first week I had caught 25 of those tree climbing rats.