Started to clean by BKULTRA glass today fairly good amount of deposit on it since I haven't been burning it too hot.I have a razor in a holder that works well,I went to spray a little WD-40 on the blade prior to me starting to scrape off the deposits.Well I sprayed the door glass lightly with a light film of WD-40 don't know why just did. I let it soak in about five minutes and then went to scrape the glass,it was unbelievable the razor took of the deposits and in less than five minutes the glass was perfectly clean,took dry paper towels wiped off the residual WD.Finished cleaning the glass with windex glass cleaner and was done. Best cleaner I've ever used bar none WD-40 you figure.