Lets see pictures of your Deck

[frenchmon]

You're lucky, I have to dust in my audio room at least twice a week. I vacuum once a week, but I only have a 8ft x 6ft area rug in there. I have one window that I never open and central air so I don't know where the dust comes from. Oh God, I sound like my mother.

I use to do heating and cooling. Have you had your ducts cleaned?

Returns suck it in....registers blow it out.