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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.

Fiber cement siding is one of the lowest-maintenance options. The material’s formula is resistant to insect activities, moisture, and most physical impacts. Vinyl and aluminium siding is also fairly easy to upkeep. All these low-maintenance options only require basic surface cleaning, caulking, and regular gutter maintenance to prevent water dams from forming. 

There are several highly durable types of siding that you can build right on top of without removing it, with wood being one of them, provided it's in excellent condition. However, a common reason for siding replacement is to eliminate materials that are in poor condition, making installing new wood siding over old not recommended. Additionally, the cost of adding siding over existing siding can increase costs to between $7 and $13 per square foot.

While almost nothing is completely fireproof, metal siding is extremely fire-resistant. It’s non-combustible so while it may eventually melt in extreme temperatures, it won’t actually light on fire itself. This can add a layer of safety to structures that wood or vinyl siding can’t, making it attractive for industrial use. Metal siding can significantly slow down the spread of a fire, giving extinguishers and firefighters a much better chance at saving the structure and containing the blaze.