Stucco is fine plaster used for coating wall surfaces or for moulding into architectural decorations. (Source: Google def.)
This type of wall needs a different treatment due to it's delicate surface structure... however stucco tends to trap dirt and dust more than other surfaces. Check out this How-To video, which explains how to handle that problem - short and sweet :-)
Watch this Video: How-to Clean Stucco Walls
Working on delicate stucco walls - avoiding all possible mistakes
But first, the wall needs to be inspected for cracks or chips, otherwise water can seep through those cracks and damage the wall behind it. (Watch video for more information.)
Those fixed patches need to dry at least a week, before using a pressure washer. The work flow is like this: (Note, that you need to know how to work with a pressure washer)
- Apply the detergent to the stucco from the bottom up in identifyable sections.
- Allow to the detergent to work a little, about 5 - 10 min. but don't let it dry: Keep it wet so it keeps working on the surface.
- On heavily stained areas, use a rotating scrub brush attachment.
- Switch to a delicate low pressure spray nozzle and before working on the wall, flush out any remaining detergent from the system. (Watch the How-to video for help)
- Start washing down the wall from the top.
- Due to the delicate texture of a stucco wall, always hold your pressure washer wand so the spray pattern hits the surface in a 45 degree angle. (See video)
- Keep the spray nozzle at least 24 inches away from the surface.
- Continue to rinse off the detergent and residue from the top down in identifyable sections.
- For rust and copper stains use a rust removing product and scrub by hand with a soft bristle brush. Then flush with plenty of clean water.
That's it. Cleaning stucco is a piece of cake - with a pressure washer!
Let me know if you need help with this.
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