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This answer is a bit tricky because experts say both. You should apply your cleaning solution from bottom to top, but rinse from top to bottom to avoid streaking. When it comes to multi-story houses, you’ll want to start at the top floor and work your way down, but follow the above instructions for each level as if it were an independent structure, rather than washing the whole house as one unit.

The ideal frequency for pressure washing depends on the surface being cleaned and your local environmental conditions. For a home's exterior with siding that is safe to wash (such as vinyl, cement, or aluminum), a full wash once or twice a year is a good guideline to remove accumulated dirt, grime, mold, and mildew. You may need to wash more frequently if you live in an area with heavy rain or snow, near a dirt road, or if you notice excessive buildup. Other surfaces have different schedules; for example, a frequently used driveway may need cleaning more often, while outdoor patio furniture might only need to be washed every few years. Use your discretion based on how dirty the area gets.

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.

Yes, acid washing can change the appearance of the original brick stain color. It removes dirt, and efflorescence, often revealing the brick's original color and restoring its natural beauty. However, if not done carefully, it can also cause slight variations in color due to the cleaning process.