Unplug the dryer and move it at least 3 to 4 feet away from the wall,or a comfortable amount of space to access the hose.
Disconnect the hose from the back of the dryer while wearing sturdy work gloves. Screws or clamps hold many hoses in place and must first be pressed.
Carefully remove the hose from the back of the dryer and empty the contents into a plastic bucket. Clean out the dryer outlet — located on the back of the dryer where you disconnected the hose — and the mouth of the hose with a vacuum cleaner hose.
Reattach the hose to the back of the dryer, move it back into place and plug the unit back in. If the hose is severely damaged or warped, which will lead to further issues, replace it with a new chunk of hose at least 4 inches in diameter.
Crawl under the house and locate the dryer hoses. The hoses are generally white PVC flex pipe attached to the beams in several places.
Poke a small hole into the sagged portions of the hose with a utility knife. Hold a small bucket of water under the hose and allow the water to drain. Perform this with caution to prevent exposure to the potentially bacteria-laden water.
Raise the sagged portions of the hose with your hands and attach with zip ties or foil tape to any nearby beams or other support under the home. This prevents any further water from collecting in the depressions.