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Avoid toxic chemicals that can leach into nearby lawns, as well as household ingredients like vinegar that can ruin paint and sealants. Instead, look for a very light detergent or a dedicated exterior siding cleaner. In a pinch, you can use a basic dish or laundry soap, but we suggest sticking with a dedicated cleaner.

If your siding is struggling with algae or moss, which indicates moisture issues, look for an outdoor cleaner that’s specifically designed to clear moss and algae stains. This is also a sign that you need to seal your clapboard against further problems.

Many modern homes have soffits, but older ones don’t, and you may be wondering why. Older homes have eaves that extend further beyond the home and help to circulate air, negating the need for a soffit. This style of building has faded away, therefore, modern homes need separate soffit installation. Modern soffits are more efficient than this older style and require less material to construct, saving homeowners money.

Some homeowners use caulk on the edges of clapboard siding to help seal it. However, this method invites new problems. With so many gaps sealed, clapboard siding is often unable to drain properly and moisture from rain or other sources can build up inside. This can lead to rot and other issues over time. When repairing clapboards, it’s best to avoid caulking the final product. The exception is trim around windows and doors, which should be caulked to avoid moisture problems.

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.