You know. Usually i roll my eyes at the "isekai MC introduces common japanese products as revolutionary" tro[e, BUT i have to admit that at least they use magic boosts to say they are better, and don't assume that a 2000 year old society has never previously considered shampoo existing at all...
If i didn't know the author, i'd be very entertained. Sadly every time i read an amusing frame my subconcious jumps up and places bets on which chapter it will get mothballed.