Translation:Wash the phone.
I'm pretty sure "전화" only stands for "call," you have to add "기" to make it mean "phone." Only saying this so Duolingo's translating system gets enhanced. Again, I'm not 100% sure; just a thought. Edit: I've seen some other mistakes too, some relating to grammar and some just not making sense. I already know a lot of Korean, thus am able to tell these types of stuff; I'm only here to try to get better at it.