"clean your room right now!"
oh no. you can't even walk into it! how do you clean it?
do you have some music? you could listen while you work. or even set a goal. ask your mom if you could have something if you finish, like a candy. but don't eat your candy until you're done, because then you won't want to keep cleaning. because remember, you're going to have to get it done sooner or later. i'd rather get it done sooner than later! if that doesn't work, time yourself. do it every time you clean. let's say today it took you 2 hours to clean. keep track. try to beat 2 hours next time. if you don't, just keep cleaning until you get it done. if you pass your time, reward yourself! soon you'll be a fast cleaner!