"Dust it off" sounds odd to me here. It is used more often when dusting something other than a part of the body. You could use it with a piece of clothing, however.
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JUNHEE LEE " clean your hands"This is a better choice. Using the word it would be odd because, you are not talking about one thing in particular. You are talking about hands, plural.
JUNHEE LEEWould you say "clean the dirt off your hands" or "brush the dirt off your hands"?Which one sounds more native...?Thank you again.You could say either but, they are a bit wordy. Just saying "clean your hands" would normally be enough.