Cách sử dụng
The expression "clean off" is used when you want to remove something completely from a surface or object. For example, if you spilled some juice on a table and you want to remove all the stains, you would say "I need to clean off the table." It is often used when referring to wiping or scraping something off of a surface. You can use this expression in a variety of contexts such as cleaning your room, removing chalk dust from a chalkboard, or cleaning your car.