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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.

Vinyl, brick veneer, stucco, steel, stone veneer, and composite siding are popular alternatives to wood siding. Which siding material is best for your home boils down to your budget, aesthetics, lifestyle, and climate. For example, stone veneer offers a timeless charm and is low maintenance but may have too high of a price tag. Meanwhile, some homeowners love vinyl siding for its low cost, while others dislike it for its appearance and shorter life span.

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.

For the materials alone, a square of siding costs an average of $600, but prices can range from $100 to $3,000, depending on the material. Vinyl siding costs toward the lower end of that range, while real brick or stone siding costs closer to the higher end. Keep in mind that many boxes of siding contain two squares, enough to cover 200 square feet, so you may need to double your cost if you only need one square.