Lavabis me et super nivem dealbabor.
Sounds like a hymn we used to sing ("Purificami o Signore. Sarò più bianco della neve.").
"You will wash me, and I will be whiter than snow" (or more literally, "and I will be of a whiteness above/beyond snow").
Thank you. That is helpful.
Why not "Could you wash me?", I think that would be more common and polite
As written in the dust on the back of a dirty chariot.
"Can you bathe me?" was marked wrong.
Not the same. Washing is cleaning with water. Bathing is washing with immersion (a bath). People can wash with shower or the old style with a water pot.
To bath = balneare.
why is "can you wash me" wrong?
It shouldn't be; it's an exact (English) equivalent to "Are you able to wash me," so it ought to be accepted; can't explain why it isn't (but note the discussion above, started by Gitirana, who asks the same question).