Our house has aluminum siding that is painted whiteWhen you rub your fingers across it you are left with a chalky residue on your fingersThe north side of the house has green algae on itHow can I remove the algae without damaging the paint?
Someone is going to say bleach, and I really really really hope you don't do thatAluminum will corrode in the face of bleachYou don't want that to happen, if you can keep the aluminum siding in good shape it will last your entire lifeThere are a few bleach-free or minimal-bleach alternatives on the marketLook for Moss Out, Wet Forget, Spray Forget to alleviate the problemSpray Forget is designed to apply and then you can just walk away, and it should help prevent the problem returning for a few yearsMy recommendation is to apply the stuff every yearNOTE: some surface chalkiness is normal with aluminum siding, so don't let the presence of the chalkiness make you think your siding is failingI'm only helping you with the algae problem, I don't consider the chalkiness to be a problem at all.
Abradley has it right hereThe common product duct tape is actually not at all suitable for ductsThe aluminum foil tape is available at most big home improvement stores as well as most local hardware stores.
the tape is ok but for your air flow to 2cd floor sealing will probably not help that a whole lot sounds like you need to have your vents balanced out someones probably messed with the vent flappers and that would throw off your system
