Kirk comes out of a door with wet hair and a towel around his shoulders, but that’s it.

Archer takes a shower on Enterprise. I think it was a Delphic Expanse episode. There was also that whole decon thing.

Jankom Pog mentions putting a sonic toilet out of commission. They don’t show it, but they do give us the flushing sound as he exits.

Voyager has a detailed sonic shower scene with B’Elanna Torres.

Then there is Lower Decks…