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Pressure washing shou sugi ban siding is generally not a good idea. The charring process used in creating shou sugi ban siding involves burning the wood's surface to achieve its unique appearance and enhanced durability. The charred surface is delicate, and pressure washing can easily damage it. Instead of pressure washing, you can clean it with a soft brush or broom to remove loose debris, followed by a mixture of mild soap and water applied with a soft cloth or sponge.

You should wait until your pavers have completely dried and cured before pressure washing them. Wait at least three to five days, though some sealants may need up to an entire week. Rushing that timeline can mess with the finish, weaken the seal, or leave streaks that are tough to fix. Once the sealant has fully set, stick to a gentle approach. Keep the pressure under 1,500 PSI and hold the nozzle at least two feet from the surface. Anything stronger or closer can blast the joint sand loose or wear down the sealant you just applied.

It’s not necessary, but you can absolutely use soap or detergent when pressure washing your house. Washing with a mixture of soap and water will ensure your siding is spotless when you’re finished. However, in many cases it is not necessary to use soap and you can still achieve a powerful result without any product. 

This process doesn’t necessarily require soap or detergent, but it definitely helps. You can get by with just using water, but remember, brick requires a lower-than-average pressure level when compared to concrete, so forgoing detergent increases the time it takes to spot clean stains and debris once you finish with the pressure washer. Brick is especially porous, so the less water you use on it, the better.