每两三年? No way, LA is quite dusty. I think 每两三month. I will check

来源: tengtengma 于 2010-09-14 17:16:33 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (86 bytes)

Usually they clean inside windows. I don't know they will clean outside or not.

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