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Yes, you can pressure wash metal fences. However, as with other fencing materials, it’s important to use the right PSI when pressure washing a steel, aluminum, or other metal fence. If you apply too much pressure, you could strip off the paint, ruin the protective coating, or otherwise damage the fence.

You could void your roof warranty using a power washer if you have a newer roof. With an older roof, you could knock loose older shingles. On the other hand, some people safely use a pressure washer to remove moss from a metal roof. Although you may want to use a pressure washer, the truth is that you probably don’t need it to knock moss loose. A garden hose and brush will do the job just fine and in a safer manner than a pressure washer.

The amount of pressure, measured in psi, that you should use depends on what you’re washing. Very tough materials like concrete, stone, and masonry can handle a high psi of 2,500 to 3,000, but materials like wood require a bit of a lighter touch. To clean your wooden deck, you’ll want to use your pressure washer on the lowest setting, around 600 psi, especially if it’s made of soft wood like pine or cedar.

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.