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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. 

No matter what types of metal siding you are cleaning, you should be able to clean them using the same processes you use for aluminum siding. Steel siding and aluminum siding both need cleaning about once per year. You can clean metal siding or aluminum siding without a pressure washer or with one.

Vinyl can withstand many different cleaning methods, but there are two things you need to be wary of. First, particularly harsh chemicals will damage your vinyl siding and reduce its lifespan. Second, be careful about pressure washing your vinyl siding. Vinyl can resist powerful washing damage more than softer siding like wood, but high levels of pressure can still crack it. Use the lowest level of pressure for power washing vinyl, or hire a siding professional to do it.

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.