Next, take a new microfiber towel and wipe down the air vent. If you still notice dust and dirt, reapply more shaving cream and scrub until you're satisfied with the results. Finally, return the cover ...

Return air vents, strategically placed in your ceiling, floor or wall ... These vents typically feature a slatted cover or grate. Unlike a supply vent, return vents will not blow air, only draw it in.