This treatment involves scrubbing off the top layer of dead skin.

这种治疗需要把死皮的表层除去。

《牛津词典》

In the most concentrated areas, he says, it could be compared to products you would clean your kitchen with, causing dry or cracked skin, or - in cases of prolonged contact - it can "lift off the top layer of your skin".

BBC: How toxic is Hungary's red sludge?

The circular movement of the cooking foods also meant that scum or skin formed neatly in the center, making it easier to skim the residue off the top.

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