Begin with the outer pane. Utilize a tender cloth or sponge to use the solution gently. Stay clear of extreme pressure, which could hurt the seals. *Renewal by Andersen of Cincinnati, Indianapolis, South Bend, Nashville, Chattanooga, and Knoxville are independently owned and operated. Renewal by Andersen of New Jersey/Metro NY, https://httpsthewashguywindowscom12211.blog-gold.com/44561504/a-review-of-replacement-windows-nashville-area