Although vinyl siding doesn't require extensive maintenance, it does need cleaning to stay looking new. The Vinyl Siding Institute recommends using general household cleaners for non-specific cleaning. Do not use solvents, undiluted chlorine bleach or other harsh chemicals.
Vinyl siding can be washed with a soft cloth or a long-handled soft-bristle brush. A power washer can also be used, however, only point the washer straight ahead. Aiming it upward can force water under the siding and cause moisture problems.