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Mildew grows into porous wood, making it more difficult to remove than regular dirt (and more destructive). We suggest using a dedicated mildew and mold fungicide to remove mildew, which is found in any local home improvement store. Apply a dose of the fungicide to the siding and leave to work according to the instructions, usually for an hour or two. Then wash it thoroughly away and scrub the spot again. Repeat the process if necessary. If nothing is removing the mildew stains, you should plan on removing those clapboard planks in time, as their damage could cause future problems.

Choosing siding combinations that look good together comes down to finding textures and colors that complement each other. You want some contrast so that your home doesn’t look boring or too uniform, but you also want the materials to play off of each other so that each makes the other stand out. It’s a good idea to hire a siding professional to create 3D renderings for you so you can get a sense of what your home will look and feel like before you get started.

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.

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.