Trick learned from plumbing contractors: Never use bar use. Only liquid body wash. Bar soaps contain paraffin, oils and other waxy products that cause scum build up. Also quick squeegee of the glass. If you have problem with hard water spots, RainX helps. If you have hard water spots on glass (including windshields) that won't come off: spray CocaCola on it and let it sit for a while. I won't drink that stuff after I have seen demonstrations of what it will dissolve.....
John & Janet Gilstrap
