I am not using shampoo for 2 years cause I think it causes premature grey hair...
I'd be more worried about hygiene from 2 years of unwashed hair than grey hair. BTW it is idiotic to believe that washing your hair makes it go prematurely grey. A friend of mine had luxuriant grey hair by the time he was 30 while in the same period I went bald. We both wash about the same amount.
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