How to Keep Spiders out of your House

I've done this to keep spiders from coming in through window cracks. Clean outside of the window, plus all around it, including the ledge, with soap and water. Dry areas with old shirt/rag. Next spray a wax dust cleaner on ledge and all around window. I was told this tip by someone who said spiders don't like slippery services. This does help for whatever reason.