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Or, you know, actual dedicated anti-fogging stuff.
All you're doing is filling all the micro-pores in the lens and/or putting a thin hydrophobic film on the lens.
Yes, dish soap works great, but it's always just a matter of how LONG it will work for.
Dish soap DOES work, but if you get enough humidity on the lens, the dish soap, or shaving cream, or shampoo is (guess what) soluble in water, and washes off.
If you use a hydrophobic liquid, then it doesn't wash off very quickly at all.
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