Just put in a new concrete patio and the neighbour's maple tree keys are leaving brown stains all over it?

Question

Pressure washing didn't work but there must be a way to remove the ugly stains. Any ideas??

Answer 1

Muradic acid should get rid of it but stains will return. Seal the concrete with a concrete sealer and it will be easier to clean next time

Answer 2

http://www.interstateproducts.com/concrete_cleaners.htm?gclid=CP_X5v6C9IYCFQilHgodLESYWw

ORANGE CRYSTAL CONCENTRATE:
Our toughest concrete floor cleaner. Heavy Duty non corrosive formula. A powdered concentrated degreaser with a high concentration of oil and dirt dissolving emulsifiers.

Uses natural citrus (ORANGE PEELS ) solvents to offer excellent degreasing and deodorizing. Use for tough concrete cleanings, hard surface cleaning, and soak tank cleaning. The biodegradable powder is orange in color and becomes a light green grease and oil cutting solution, when mixed with water.

100% water soluble. To use as concrete floor cleaner :Simply either mix 1 pound with 5 - 10 gallons of water by bucket, and brush or 1 pound with 40 gallons of water by pressure washer. For stubborn floor stains- wet floor, sprinkle concentrate, agitate and rinse. Removes stubborn stains with a natural solvent. Water soluble and biodegradable, fresh citrus aroma.
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http://www.naturalhandyman.com/iip/infxtra/infmur.shtm

The most popular concrete and grout cleaners on the market contain Phosphoric Acid. This acid will, under most circumstances, do as good a job as muriatic acid, but with less danger. Phosphoric Acid Cleaners also contain chemicals which emulsify oils to help the acid work more effectively and safely increase its cleaning properties.

TSP (trisodium phosphate) is another formidable heavy-duty cleaning product and can be used to clean masonry surfaces that are going to be left uncoated. TSP does not etch the surface. Due to environmental concerns of phosphate pollution, TSP cannot be legally used in some areas.

Mechanical cleaning methods such as sandblasting, abrasive wheels and special power tools can be rented at many rental centers or hardware stores, where you will also receive instruction in their use.

(ps) Most cities allow you to trim what is hanging over the fence.