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Many people remove aluminum siding to get to the wood underneath, allowing them to paint, stain, or finish the wood to give the home a brand-new aesthetic. With that in mind, you find plywood and related types of wood underneath aluminum siding, but you also run into fiber cement board, strand board, and a diverse array of other building materials. It depends on the original design of the house. 

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.

While bleach can be effective in killing mold, it may not fully remove mold stains from siding. Additionally, bleach can be harsh and may damage certain types of siding. It's recommended to use specialized mold cleaners or natural alternatives that are safe for your specific siding material as a part of your regular siding maintenance. 

Stucco is considered a type of cladding because it includes a built-in ventilation layer, a weatherproof membrane beneath that, and, often, a layer of insulation to improve building efficiency. The multiple layers of stucco—the scratch coat, the brown coat, and the finish coat—also create a more complex building membrane, so it’s more accurate to call it cladding. However, homeowners and contractors alike refer to stucco as siding.