Removing Concrete Stains & Concrete Stain Removal
Concrete is a hard and durable building material. It is also
porous and susceptible to staining. Painting or sealing a
concrete surface is a good way to prevent staining.
Unpainted or unsealed concrete can quickly become unsightly
due to oil, grease, trees, birds or other agents. Often
these stains can be removed easily.
The tannins found in tree sap, leaves and nut husks have
been used as a natural stain for wood and yarn for years.
They can also stain concrete. Oil and grease are common
culprits.
Each type of stain has its own challenges. Much of your
success will depend on the severity of the stain. You may
have to clean the area several times to get results. It also
helps to act as quickly as possible after the stain occurs.
Clean large amounts of a fresh spill by covering the area
with cat litter. The litter will absorb most of the
material. Dispose of the used litter properly.
To remove remaining material or if the stain is old, it is
advisable to always look for a cleaner specially formulated
for cleaning concrete. If you are in a pinch, try one of
these:
- Household bleach - Dilute as the directions
indicate for cleaning. Let the solution sit on the
stained area for several minutes, then scrub and rinse.
- Laundry or dishwashing detergent - Sprinkle dry
detergent over the area. Let it sit for a few minutes
and then scrub with hot water.
- Tri-sodium phosphate (TSP) - Dilute one cup in
one gallon of hot water. Pour it on the area and let it
sit for 15-20 minutes. Scrub with a stiff brush. Rinse
off with hose and repeat if needed. TSP is also
available in a phosphate-free version.
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SAFETY
NOTE
Always
wear eye and skin protection when using cleaning
chemicals.
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Muriatic Acid
Muriatic acid is not a stain remover or cleaner.
The acid actually etches away the concrete itself, and
sometimes the stain as well. You will need to scrub and
rinse this chemical also. Follow the directions carefully
and WEAR EYE AND SKIN PROTECTION. Since you will be removing
the actual concrete, use muriatic acid only if you seal the
driveway with masonry sealer afterwards. Remember that you
will be altering the level of the surface if you remove a
lot of material.
To avoid damaging concrete:
- If you use a pressure washer, make sure you have the
right nozzle. A jet that is too concentrated can damage
concrete.
- Use a nylon scrub brush, not wire.
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