A Warning for Window Washers

David Hurwitz, owner of Glass with Class, a Diamond Certified company, knows all the ins and outs of window washing. I asked him about common mistakes people make when washing windows for starters, Mr. Hurwitz says you should never blast your windows with the garden hose. That’s because we have hard water in the Bay Area and it can leave expensive-to-remove water stains on your windows.

Another way to damage your windows is to use a dark green scrubber on the glass. It might scratch the glass. Instead use a lighter-colored scrub pad; white or light yellow pads are best. Stay away from ammoniated cleaning products because they eventually break down the seals in double-paned windows and cause fogging. And Mr. Hurwitz’s last piece of advice is to stay off of those inexpensive extension and stepladders. Most have bad locking mechanisms. Avoid serious accidents by leaving the highest windows to the professionals.