Your house needs a good washing when dirt, mildew, and tree sap accumulate on the siding and trim. By keeping the exterior of your house clean, you’ll prolong the life of the siding and trim and reduce the need to paint it. Your option is to hire a house cleaning service, which uses a pressure washer, or do it yourself by renting a power washer for a day (or two, depending on the size of your house).
You’ll find house cleaning services listed online and on a local neighborhood exchange. Some companies send out a mailer or post a flyer at a home center. Or try the old-fashioned way and when you notice a house being cleaned, ask the owner if they’re satisfied with the job.