Power Washing Vinyl and Aluminum Siding
If you decide to power wash your vinyl or aluminum siding, please be sure to read your power washer instructions carefully before you begin. When cleaning, hold the power washer straight at eye level. Don’t aim the washer upward as the water may collect behind the siding. This collected water could leak, which can produce streaks, or could stay behind the siding, which can cause decay. Set the pressure using a minimum of 1,500 PSI and maximum of 2,400, using a 40-degree tip.
Taken from: http://www.mastic.com/Homeowner/Learning_Center/Repair_Instructions/Maintenance___Repair.aspx
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