You can pick up some betadine and use that as an antiseptic. I don't think salt is a good idea (and would hurt!).

Betadine is available at Walgreens or other large pharmacy stores.

Also, please remove any structures he can climb on. BP's are not skilled climbers and can easily fall onto cage furniture.

This time might be a scratch, next time might be a few broken ribs and internal injuries.

You can post a picture and we can help you figure out what needs fixin.