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You can clean light stains off of concrete using a pressure washer with 2,000 psi, or you can clean tougher stains if you use a smaller nozzle and point the wand closer to the stain. You may also need to go over the surface more than once for a deeper clean. If you want to clean concrete faster, consider using a pressure washer with a psi of 3,000 or higher.

You should never use bleach in a pressure washer. While bleach is effective at killing mold and mildew, it is a potent chemical that can corrode the machine's seals and nozzles, destroying it from the inside out. Additionally, pressure washing with bleach sprays the chemical into the air, which is dangerous if inhaled and can kill nearby plants, flowers, or harm animals that ingest it. If you need to remove mold or mildew, it is best to hire a professional who will use a safe and effective cleaning agent.

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.

The time it takes to pressure wash your driveway is mainly based on size (but your driveway’s material and condition also play a role). Small driveways can be pressure washed within an hour, medium within two hours, and large within four hours. However, this does not consider any prep time or time that sealing your driveway would take.