You should see the acid mix fizz.
Removing hard water stains on concrete.
Using the toilet brush swish the solution around the bowl to ensure that it covers the entire bowl including above the water line.
In most cases a mildly acidic cleaner combined with some scrubbing can remove these stains without etching concrete.
Wet the surface lightly and scrub some acid mix into it with a deck brush.
When the activity dies down wash the area immediately with water so that the residue doesn t dry beforehand.
If this doesn t work try rubbing some dishwashing liquid into the spot with a toothbrush then rinsing off.
Put on protective rubber gloves and then combine 1 pound of trisodium phosphate with 5 gallons of warm water.
Put the 90 water in a bucket and add the acid to it.
Try pouring hot water from several feet above the stone onto the stain.
It is used on colored concrete and is very effective.
If you don t want to use a cleaning solution like tsp you can try substituting white vinegar or lemon juice.
Apply a second layer of white vinegar and scrub the stain with a stiff bristled scrubbing brush vigorously for at least two minutes.
Apply undiluted white vinegar to the entire mineral deposit you are attempting to remove and allow the stain to soak for approximately 20 minutes.
Use a nylon brush to scrub it away.
If any fertilizers are in the water they can also stain the concrete.
In the morning scrub the stains away.
Often you can remove a brand new stain with only household cleaner and water.
It s best to wear rubber gloves.
Don t rub the surface it will drive the stain further into the concrete.
Next work it into the concrete stain using a stiff broom or brush.
Another way to remove hard water marks is with trisodium phosphate otherwise known as tsp which is recommended for use on decorative or stamped concrete.
If you have stains on paving stones or a concrete patio sometimes the solution is simple.
Hard water deposits can quickly make your bathtub look nasty and unclean.
Let it sit on the hard water stain for 15 to 20 minutes then scrub and rinse it off.
If the stain resembles a chalk like residue then you should remove it with an efflorescence remover.
Repeat several times and your stain may just disappear.
Soak up as much as possible with paper towels.
Wait and let the solution fizz.
It will probably take more than 1 time to completely remove all the hard water stains on the concrete.
Hard water stain removal from the tub.