A thorough cleaning with a concrete safe cleanser lightens stains and usually removes them completely.
How to clean water stains off concrete walls.
Scrub a mixture of dish soap and water on to the stain and rinse it off using high pressure from a garden hose with a nozzle.
Now rub the mixture on the stain with a mop or a rag.
Simple take 5 gallons of warm water and combine 1 pound of tsp with it.
Wash it off with clean water and repeat as necessary.
1 spray the entire wall with water to rinse off dust and dirt.
If the stains are left on decorative concrete then you should use trisodium phosphate or tsp as it is most commonly known as.
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Wet the concrete stain with a bit of plain water and then rub the acid mixture into it using a coarsely bristled scrub brush.
Spray the concrete stains with the soap solution.
Let it sit on the wet stain for about 10 minutes or so then scrub in a circular motion.
Spray the wall as necessary.
Pour plain water into the bucket prior to adding the acid.
Create a cleaning solution of 10 percent hydrochloric acid and 90 percent water in a bucket.
Allow the solution to fizz and then rinse it off with plain water.
When groundwater consistently infiltrates the porous concrete walls through capillary action wall stains and related problems can occur.
Apply a second layer of white vinegar and scrub the stain with a stiff bristled scrubbing brush vigorously for at least two minutes.
It this doesn t work repeat using oxiclean instead of dish soap.