Please wipe out the place of the cup your lips touch by your fingers after you drink.
Please clean up the place of the cup your lips touch by your fingers after you drink.
"お茶碗に口をつけた場所を指できれいにする"
きれいにする wipe out, clean up,
お茶碗に口をつけた場所、the place of the cup your lips touch
指で by your fingers, by fingers
Please wipe out the place of the cup your lips touch by your fingers after you drink.
Please clean up the place of the cup your lips touch by your fingers after you drink.