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To clean painted aluminum siding, use a mixture of mild detergent and water applied with a soft brush or sponge. Rinse thoroughly with a garden hose to remove soap residue. For stubborn stains, cleaning aluminum siding with a power washer on a low-pressure setting can be effective. But avoid using high pressure, which could damage the paint.

While insulated vinyl siding has one of the highest R-values out there, there are a few alternatives worth considering. When paired with a layer of insulation, manufactured stone veneer has an R-value of 4.5. Composite siding also provides good insulation with an R-value of 2 to 4. 

You cannot install clapboard siding on a bare, unprepared surface. Clapboard siding requires a clean, sturdy base made from plywood or similar materials, sometimes called backerboard. Then, it needs an underlayment or sheathing, a moisture membrane to help protect the exterior wall.

Note that sometimes clapboard siding is caulked as it’s installed for additional protection. We don’t suggest this: Caulking the siding can trap moisture inside the clapboards and lead to moisture damage over time. The siding needs some space to “breathe,” especially in rainy weather.

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.