Any time my dog licks a bowl clean, it takes forever to wash his saliva off. Much harder than oil or even butter. Yes I am using dish soap, hot water, and a scrubby sponge.
In: Biology
Dish soap is designed specifically to interact with fats. The soap works as a binding agent between fats and water, letting water combine more easily with fat and break its connection with the plate.
Unsurprisingly, dog slobber doesn’t contain much in the way of fats. So dish soap has nothing to bind to in the same way.
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