Lemm observes with some confusion, and then a flicker of mild alarm - and then just flat confusion again, for a bit.

Are they going to use that stuff on the ceramic? It won't do any harm but he doesn't see the need for a wet cloth when the thing is already so clean - oh, it was an accident. His confusion vanishes in a wisp.

What is apparently a big private deal to the Hollow Knight barely registers on his radar. Maybe there is an issue wringing out a wet cloth what with only having one hand though? His tone is entirely unbothered.

"It's just water and polish. D'you you want some help?"