Ventilation grills protect a building's heating and cooling system by keeping large objects from entering the ductwork. Most of them are square- or rectangular-shaped metal or plastic sheets with an array of slits that allow air to circulate freely. Metal grills are usually held in place by screws in each of their four corners; plastic grills are usually held in place by plastic snaps. They all require periodic cleaning because they collect dust and other airborne debris. Cleaning them is a simple housekeeping task that is neither overly messy nor labour intensive.
Unscrew the grill and pull it from the wall if it is held in place by screws; pry it from the wall and pull it off by hand if it is held in place by snaps.
Spread the newspaper on the floor in the area where you will be cleaning to protect your flooring. Mix the cleaning detergent with warm water. Dip the brush into the soapy water.
Scrub both sides of the grill will the brush. Dry the grill with the towel after you have cleaned both sides.
Screw or snap the grill back onto the wall.
Dust the grill between major cleanings to prevent dust build-up.