The key to cleaning brick is less pressure more detergent.
Brick cleaning pressure washers.
Use a surface cleaner attachment or higher pressure nozzle to clean the brickwork again working from top down.
For brick you ll want a pressure washer that works at a range of 500 2000 psi.
At the right psi the water stream is strong enough to remove algae dirt and color shadowing from your brickwork without damaging the brick.
Let the soap do its job loosening and moving the dirt out of the brick.
Let the wall dry for a few days before washing.
Start by choosing the proper pressure and nozzle tip.
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Patch cracks and holes in the brick or mortar before you wash the wall so water won t seep behind it.
Close all of your doors and windows and cover nearby plants and furniture.
Choose the tip with the widest angle that still gets the job done to prevent degrading the surface of the hardscape.
Spray in horizontal strokes over a 3 or 4 foot wide area at a time.
Set the pressure washer to 1000 psi or less and use a 40 degree fan tip nozzle.
Allow it to work into the brick for 5 10 minutes.
A pressure washer with about 3 gpm and 3000 psi is ideal for most concrete and brick cleaning jobs.
Bricks and mortar are porous so the detergent and water will soak in a bit.
To help you setup your pressure washer correctly check out these tips and tricks.