These stains are caused by chemical fertilizer granules that are left on concrete surfaces.
How to remove white fertilizer stains from concrete.
Given enough time acid rain can clean the majority of white concrete stains but many homeowners do not wish to wait to remove the problem.
Many consumer fertilizers today contain a small percentage of iron a mineral your lawn needs to stay healthy but which your concrete certainly doesn t.
Scrub vigorously with a stiff broom or scrub brush.
Removing the fertiliser stains without damaging the pavers is usually possible.
How to remove fertilizer rust stains from concrete.
Severe stains may require a second application.
First scrub the concrete stain with dish soap and water in order to remove as much urine as possible.
Decide if you want to use a dry method or a wet method.
Get those unsightly grease oil and transmission fluid stains off your concrete driveway or garage floor.
Let it sit for a few minutes.
Occasionally white stains also appear from salts in the fertiliser.
Dry methods include scouring grinding or sandblasting away the stain.
Use a clear white vinegar and dilute it 50 50 with water.
Pour fresh lemon juice onto the stained area.
If you catch the stain early this might be all you need in addition to some sunshine odor can be further reduced by an application of distilled white vinegar.
For this article we will focus on a wet method.
Pavers are usually made of concrete mixed with sand or pebbles so power washing is not an option as it may break the pavers apart.
Apply solution to fertilizer stains.
Apply an organic detergent as recommended above to damp concrete.
These methods will also remove a portion of the concrete so most people choose to use a wet method.
However the pet store products are most effective.
Spray them with easy off no fume oven cleaner in the blue can.
Scrub the stain lightly and then rinse.
This may sound weird but fertilizer really can leave rust stains on your pristine concrete.
Apply the vinegar and water solution to the stains several times.
Purchase an acidic efflorescence stain remover available at hardware stores and home centers.
Dilute clear white vinegar with water.
The white residue on the surface of new concrete can be removed only with an acidic cleaner.
Wet methods use chemicals to remove the stain.
Rinse the concrete with water until you remove all the soap.