Doing light cleaning before the cleaning lady comes to preserve your image or keep her from seeing how you really live.
I've got to pre-clean my house so my cleaning lady won't see all the condom wrappers and beer.
Friend A: I'll have to meet you later, I have to clean my house.
Friend B: Why?? Don't you hire someone?
Friend A: Yea but I gotta pre-clean so they don't see how messy I really am.