If Kevin had actually done regular work outside in his dust bowl - say, regular enough that there would not be shit piles visible from space currently, and instead have nice developing topsoil - that alone would smooth his skin considerably. PL, I work outdoors and the dust in the wind exfoliates my skin every day; my coworkers all have smooth skin as well, even though they aren't as consistent with the SPF. I could sperg about different ingredients that may help Kevin, but the exercise of regular physical labor alone would do a great deal of skin improvement - boosting blood flow, lymphatic drainage, cellular metabolism and turnover.
Granted, with dung sitting on the surface of the Tranch currently, his skin would more likely break out or otherwise negatively react with inflammation with a poopdust microexfoliation.
