Tannin, the very same ingredient which makes cleaning wine stains so difficult, also can cause issues with concrete outside. Because concrete is a porous substance, it is susceptible to discoloration by natural environmental influences. Brown stains on concrete can be caused by tannin from nearby acorns and trees. 

Silky Terrier Dog Breed Playing Aro... Silky Terrier Dog Breed Playing Around

If concrete is really not secured properly and is left to the outdoors or spills, this will turn discolored. Whether you’ve tried washing this with standard detergents or water to no effect, some few ordinary household substances can get rid of the stains. Once you’ve cleaned the current spots, try coating the concrete with just a solvent- or silicone-based concrete sealer to stop additional staining.

Use a hose or a pail to wet down the concrete. It assists in the adsorption of baking soda to the area.

Apply baking soda across the discolored spots. To form a mixture, gently moisten the baking soda. With just a stiff-bristled scrub brush, rub some baking soda into concrete. A wire brush can not be used because it can harm the concrete.

Let the baking soda mixture remain just on concrete for at least 24 hours. This helps the baking soda to dissolve the elements inside the concrete that really are staining it. Let the concrete completely dry.

Clean the stained spots with vinegar and bleach. If you’re planning to just use vinegar, don’t reduce it at all. Spread that onto the concrete but use a scrub brush to rub it into the area. If the color begins to fade, continue the cycle till the discoloration is totally gone. Wash the concrete with a mix of 3 tbsp bleach and 4.5 litres of hot water.