I would try to use a power washer. Some local home stores rent them out. Or if you have a local tool rental company. I don't know if the one you purchase for the end of your garden hose would be strong enough.
Hello. A pressure washer works great! Test a area first to get the feel of it and make sure it won't damage the wall. I have also used a garden and lawn sprayer. I mixed 50/50 water and bleach and sprayed it on. Let is sit for about 15 minutes and rinse. Good Luck!
Vinegar, .99 a gallon, and a broom or brush. Caution, it will kill anything where it runs off! Grass, flowers etc. Very good for grass and weeds in cracks in sidewalks and driveways too. Much, much cheaper than round up etc. not much cheaper than bleach but no problem with caustic bleach fumes or bleaching out of colors. I also use it around fence posts, around And peramiter I want to keep weeds from invading. Good luck. P. S. Epsom salts are very good to kill moss in the lawn or garden plus contain magnesium which most soils are deplete of. My best lawn and garden hacks.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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I would try to use a power washer. Some local home stores rent them out. Or if you have a local tool rental company. I don't know if the one you purchase for the end of your garden hose would be strong enough.
http://homeguides.sfgate.com/clean-restore-natural-stone-patios-95802.html
use Wet and forget
Hello. A pressure washer works great! Test a area first to get the feel of it and make sure it won't damage the wall. I have also used a garden and lawn sprayer. I mixed 50/50 water and bleach and sprayed it on. Let is sit for about 15 minutes and rinse. Good Luck!
A power asher
Vinegar, .99 a gallon, and a broom or brush. Caution, it will kill anything where it runs off! Grass, flowers etc. Very good for grass and weeds in cracks in sidewalks and driveways too. Much, much cheaper than round up etc. not much cheaper than bleach but no problem with caustic bleach fumes or bleaching out of colors. I also use it around fence posts, around And peramiter I want to keep weeds from invading. Good luck. P. S. Epsom salts are very good to kill moss in the lawn or garden plus contain magnesium which most soils are deplete of. My best lawn and garden hacks.
Pressure washer to get it off and then regular spraying of vinegar to keep it away.
pressure wash, spray first with a 50/50 solution of bleach and water. Wait a day then pressure wash.