Power washing vinyl siding is an effective way to remove built-up grime, as long as you do it correctly. The short version: protect yourself and your yard, treat mold by hand first, use only as much pressure as you need, and always spray downward so water does not get behind the panels.
Vinyl siding is easy to maintain, but it still needs a wash from time to time. Here is how to go about it.
Protect Yourself, Your Yard and Your Belongings
Start with safety. Wear a mask, goggles and gloves to protect yourself from cleaning chemicals, mold and flying debris.
Cover nearby plants and move lawn furniture into the garage or another safe spot. Cover any outdoor electrical outlets in the area before you begin.
Close every window and door tightly. A power washer can force water past worn seals, so go easy around frames. If water gets inside while you work, that is a sign the unit is no longer sealing well. Worn units can be replaced with vinyl replacement windows or new entry doors and patio doors.
Treat Problem Areas First
Look for patches of mold or mildew and scrub them by hand before you bring out the power washer. Make a solution of bleach and water, spray it on the mold, remove as much as you can with a soft brush, and rinse with water. Then you are ready to wash the whole exterior.
Steps for Power Washing Vinyl Siding the Right Way
Use the right cleaner and the least pressure
Use a cleaning solution that is made for power washers. Start with the machine on a low setting and spray a bottom corner of the siding as a test. Adjust the pressure until you find the lowest setting that gets the job done.
Keep your distance and work in sections
Stand several feet back from the house so the spray does not damage the siding. Work on one section at a time until the stains are gone.
Always spray downward
Never aim the spray upward. Water driven up under the panels gets behind the siding, where it can cause mold and other moisture problems.
Let the cleaner work, then rinse
Let the cleaning solution sit for several minutes to loosen dried dirt and grime. Do not let it dry completely, because it can leave residue or streaks. Rinse with plain water, working in sections from top to bottom, and let the siding air dry.
Look for Damage While You Clean
Washing the house puts you close to every wall, which makes it a good time for an inspection. Cracks, bulging panels and loose pieces are signs that siding may need repair or replacement.
Check the details too. Look at the caulk around windows, the condition of door frames and thresholds, and the closers and glass on your storm doors. Small problems found now are much cheaper to fix than water damage found later.
Frequently Asked Questions
Can power washing damage vinyl siding?
It can if the pressure is too high or you stand too close. Start low, test a bottom corner and stay several feet back.
Why should I spray downward?
Spraying upward pushes water behind the siding, and trapped moisture can lead to mold.
Do I need to remove mold before power washing?
Yes. Treat mold and mildew by hand with a bleach and water solution and a soft brush first, then wash the full exterior.
Found a Problem With a Window or Door?
If cleaning day turned up a leaky window, a worn door or another exterior issue, the team at Aladdin Inc. in Wallingford can help. Contact us or call (203) 776-9996 to learn more.