Vinyl siding can be washed with just a soft cloth. For siding with a textured finish (or any other siding as well), a long-handled, soft-bristled brush can be used to get into the grooves. It’s best to start at the bottom of your home and work your way up making sure you rinse the cleaning solution off prior to it drying. Remember to cover any parts of your house that has brick facing so runoff doesn’t affect it.
Can vinyl siding be cleaned with a power washer?
First, check to see what the siding manufacturer recommends for power washer use. Some will not allow it on any of their products, while some will have pressure limitations and advise against using pressure washers near wall openings like doors, windows, electrical outlets and plumbing.
If there is no problem with using a power washer, make sure you point it straight rather than upwards as water may be forced behind the siding. Read your washer’s instructions carefully before use.
How do I remove mold and mildew?
Small spots of mold and mildew can be handled with cleaners such as Fantastik® or Windex®. For larger sections, a solution of vinegar (30%) and water (70%) has proven successful. Alternatively, you also could try the following solution: 1/3 cup (2 2/3 ounces) powdered laundry detergent (e.g., Tide®, Fab®, or equivalent), 2/3 cup (5 1/3 ounces) powdered household cleaner (e.g., Spic & Span®, Soilax®, or equivalent), 1 quart (32 fluid ounces) liquid laundry bleach, and 1 gallon (128 fluid ounces) of water.
What types of vinyl siding cleaners should I use for other stains?
NEVER use cleaners containing organic solvents, undiluted chlorine bleach, liquid grease remover, nail polish remover, or furniture polish or cleaners. They can affect the surface of the siding. A list of commonly accepted cleaners is provided in the box below. Make sure you check the cleaning product label before using it on a large section of siding. Once the stain has been removed, rinse with clean water.
Vinyl Siding Cleaners:General cleaners (e.g., Simple Green®, Nice & Easy®, Armor All®, etc.) can be used to clean dirt, bird droppings, and spider webs. Stain-specific cleaners are listed below. Rinse all cleaners with water before they dry.
Source:
http://www.erroofingcompany.com/siding/maintenance-cleaning-vinyl-siding.htm