
I had a bottle that was soiled with baked on powder and was black on the bottom. The tablet removed 95% of the dirt and I used a bottle brush to remove the rest. Not sure if very hot water would work better, I've only used hot tap water. I've used it for general cleaning and it cleans well and doesn't stain or stain. Heavy, thick dirt may require 2 cleanings, but this is not cost effective.

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