To safely clean standard house siding (such as vinyl, brick, or fiber cement), you need a pressure washer that operates between 1,500 and 2,500 PSI with a flow rate of 2 to 3 gallons per minute. Using higher pressure or narrow spray nozzles can force water behind siding panels, crack caulking, and cause severe structural water damage. Coupling this moderate PSI range with a safe biodegradable house-washing detergent ensures effective organic grime removal without risking property damage.
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