Hey this is a response to your question. A couple months ago I had considered the possibility of entering into a new business venture as a pressure washer. For many years in fact 13 years I own my own business as a roofing company. Matters went down the hill and I lost my company and I started deciding about pressure washing and in my search for things I found some responses from people online about the best way to clean vinyl siding using a pressure washer. My suggestion to you is to stay online and ask around but definitely use a pressure washer but be careful not to insert the water into the vinyl by going uphill certainly you wash from bottom to top and then rinse from top to bottom but vinyl siding can be penetrated so be careful in your efforts so as not to infiltrate the vinyl siding with the pressure of water and I cannot remember the solution that was suggested to me that would work best but do some research online
Id say bleach and water and a good power washer!
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