Cleaning Vinyl Siding
Over time vinyl siding can begin to look dull. Cleaning should be done on a regular basis, to keep the process as easy as possible, right along with regular maintenance and inspection. It is a very good idea to put regular inspection at the top of the list to avoid progressive damage that may occur unnoticed.
Practice Ladder Safety While Using a Vinyl Siding Cleaner
Cleaning Your Home's Siding: Tips for Vinyl Siding or Stucco
Cleaning Vinyl Siding in Three Easy Steps
It is not recommended to use a pressure washer for cleaning vinyl siding as the water can be forced underneath and through the seams, when that happens the underlying wood and structure can, and most likely will begin to rot. Mold and mildew will very likely cause an unknown progressive, most probably very costly in damage by the time it is discovered. If it is your desire to use a pressure washer anyway, you would be well advised to proceed with much caution on the lowest possible pressure setting to avoid the above as well as avoid stripping off your paint application.
Cleaning vinyl siding is best done with soap, water and elbow grease. Starting at the top, use a soft bristle brush with a long handle and a bucket of mild detergent, such as dishwashing liquid, in warm water and work your way down. You should wash in areas large enough to be productive but small enough so the soap does not dry before you can rinse it off thoroughly with a water hose. Repeat the process until done. If the siding has become chalky from weather exposure, you will probably need to scrub with a short bristle brush.
Always practice safety when working on ladders, especially when working with slippery substances like soap and water. Skid proof shoes are a good idea. Also, it is a good idea to have someone within earshot when working on a ladder in the even something goes wrong.