I have a problem with water run off causing some dark staining on light coloured brick. The water is dripping down from the canopy and running along the brickwork all the way down to the ground.

I plan to fix the root cause of this with a bit of guttering. What I'm not so sure on is if there is a way of cleaning the staining off the brickwork? Since the brickwork is a light colour, is there anything extra I should be wary of when attempting cleaning?enter image description here

  • I wouldn't touch it. It's 'character'. Hang a wreath or something under the speaker. Maybe a nice tall plant.
    – Mazura
    Feb 8, 2020 at 2:45

2 Answers 2


First of all you want to start slow on this with a little spot cleaning to learn what works in your particular situation. I've used power washers with detergents or bleach with success in these situations but you do have to be careful.

Sometimes the cure is worse than the disease. Often when you clean brick or any surface you can end up with uneven coloration unless you do the entire wall. What I would suggest is start small with a light bleach solution (1 cup to 1 gallon water) and a brush (not wire) and try it on a small area that's not conspicuous.

Getting it to match the surrounding brick is the tricky part. You want elbow grease but not too much - and feather out the edges to blend it. Let it dry to see if it did the job. If the bleach solution doesn't work you might have to go to a commercial product. Prosoco is one but there are others. If you can get the coloration close but still not what you want you might be able to even it out further with power washing. But once again for best results you may need to power wash the entire wall.

Also if you do power wash you'll need to be careful around windows and cover and protect lights and that external speaker you have. Your brick looks in good condition but avoid any areas with the power wash where the mortar is loose or has gaps - maybe around windows. Good luck!

  • +1 for suggesting to test a small area before doing the whole wall. I would not use a pressure washer as there appears to be many holes and gaps in the mortar joints. I’d only do a hand cleaning...and Prosoco Masonry Cleaner is the best, in my opinion.
    – Lee Sam
    Feb 7, 2020 at 1:15
  • Sometimes the cure is worse than the disease. +1. I call it a 'making a clean spot'. And you can't clean up clean spots.
    – Mazura
    Feb 8, 2020 at 2:35

You really have two choices:

  1. Scrub with muriatic acid
  2. Power/pressure wash
  3. Do nothing because you don't want to do it right

With either route you will likely need to clean the entire wall because if you only clean the problem area then it will be cleaner than the rest of the wall.

  • @Mazura Added, thanks.
    – MonkeyZeus
    Feb 10, 2020 at 19:42

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