✅ E-FORCE (for Low-E Glass)E FORCE, for Low E Glass The last bastion of Window Cleaning (well the latest challenge) is to clean Low E Glass EFFICIENTLY within the guidelines of the Manufacturers specifications. Low E coated glass has a very thin metal coating on the interior glass surface. This tin coating gives the window its improved thermal insulation and solar control performance compared to ordinary clear glass. The coated surface side of Low E Glass is to be cleaned