Replacing the no longer recommended dryer vent hose for what is recommended by all dryer manufacturers. If you have white vinyl hose or thin foil you should change it or get a company in to do this for you.
wrong dryer hose
Do you have the incorrect hose connecting your dryer to the wall? Your dryer warranty could be voided for running your dryer with the wrong hose, and be at risk from a dryer fire. Thin foil and white vinyl are not recommended by dryer manufacturers