If the stains are left on decorative concrete then you should use trisodium phosphate or tsp as it is most commonly known as.
How to clean water stains off concrete walls.
It this doesn t work repeat using oxiclean instead of dish soap.
When groundwater consistently infiltrates the porous concrete walls through capillary action wall stains and related problems can occur.
Simple take 5 gallons of warm water and combine 1 pound of tsp with it.
1 spray the entire wall with water to rinse off dust and dirt.
Now rub the mixture on the stain with a mop or a rag.
Apply undiluted white vinegar to the entire mineral deposit you are attempting to remove and allow the stain to soak for approximately 20 minutes.
Apply a second layer of white vinegar and scrub the stain with a stiff bristled scrubbing brush vigorously for at least two minutes.
Pour plain water into the bucket prior to adding the acid.
Spray the wall as necessary.
To remove pour one eighth of a cup of liquid dishwashing detergent into a spray bottle then top off the bottle with warm water and shake well.
Allow the solution to fizz and then rinse it off with plain water.
Therefore the first step to correct any type of basement wall stain problem is to provide adequate foundation drainage in order to minimize the water infiltration.
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.
Let it sit on the wet stain for about 10 minutes or so then scrub in a circular motion.
Spray the concrete stains with the soap solution.
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A thorough cleaning with a concrete safe cleanser lightens stains and usually removes them completely.