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3 tubs of the stuff lasts us months.I bought 100 tubs for a pound a tub. Usually hand a new clean customer a tub and a scrub pad so they can clean difficult stuff themselves. I see I just jumped in regarding moss on corners of glass. Not really a problem with hot water because first thing I do is go around and wet all the windows with the brush. Then go back and begin cleaning all the windows and doors. Finally go back and clean them all again especially the glass any stubborn bits I will give them a good soak and go back to them in the end. The hotter the water then the easier stuff breaks loose, a bit like a washing machine's 60 degree wash. I could never go back to cold, did it for a few houses and gave up. I'm Conditioned to use hot and couldn't go back the way. fwiw