Start at the bottom left corner (or right if you’re left handed) wipe up then turn the squeegee as you’re wiping so only the end goes to the corner and the squeegee is now facing the top right (or left if you started opposite) corner, repeat the motion to end in that corner then continue sweeping left and right moving down the window horizontally now until the whole window has been squeegeed. The important thing to remember when weilding a squeegee is don’t lift it off the window while you’re cleaning. Tracks were cleaned with toothbrushes or the wood brush depending on the size. For dust and cobwebs he’d break out a wood brush, the standard kind found in the hardware aisle with soft bristles and wooden handle.

As long as the window is soapy it won’t leave any scratches on the window.

For getting off tough goo he would soap up the window, then take a straight razor or 0000 steal wool (dipped in the soapy water). I got a kick out of the fact he repelled down buildings for a living 😉 He used this method, plain old fashioned dawn dish soap, a scrubber (it’s like a towel/sponge on a squeegee), and a squeegee. When I met my husband 11 years ago he was a professional window washer.

Best way to clean windows inside