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The recommended PSI (pounds per square inch) for cleaning vinyl siding can vary, so it's best to consult the manufacturer's guidelines. Generally, vinyl siding can handle high pressure, from 2,500 to 3,500 PSI. For comparison, more delicate materials like wood and aluminum siding should not face more than 1,500 PSI. To safely disperse the pressure on vinyl, use a tip with a wider spray span, such as a green (25-degree) or yellow (15-degree) nozzle. For routine cleaning of light dirt, a garden hose with a spray nozzle may be sufficient. Always exercise caution to avoid using excessive pressure that could damage the siding.

Although dish soap will work to clean some of the grime off the aluminum siding, it may not kill mold and mildew as efficiently as a cleaning solution you can buy at a hardware store. If you have oily or greasy substances on the aluminum siding, rather than mold and mildew, dish soap should work extremely well.

The necessary frequency of mold cleaning in your home will depend on several factors, including the climate, the presence of moisture sources, and the type of siding. It's generally recommended to inspect your siding regularly and clean any mold growth as soon as it appears to prevent it from spreading or causing damage. If you’re not sure how often you should clean mold off siding, you can always contact a siding contractor near you to consult on what maintenance schedule will work best for your home. 

If you buy new cedar, the process of cutting it usually roughs up the surface enough that it doesn’t require sanding. However, if you buy older cedar or you’re repurposing it from another application, it’s a good idea to sand it. This helps the stain settle into the grain, and results in a more uniform appearance.