On concrete or cement that is suffering from dirt, algae, mildew, or tannin stains caused from sticks and leaves, an effective solution is house hold bleach and soap. A common concrete cleaning mix is 1 part bleach to 2 parts water and a few squirts of dish soap for every gallon of mix.
For heavier mildew killing power use 1 part bleach to 1 part water with the same amount of dish soap to pressure wash concrete. You can apply this solution with a pump up sprayer, just be sure to rinse the pump out with water afterwards. You may also choose to apply the cleaner with a brush on a pole. Be sure to wear the proper personal protection when working with any chemicals.
After allowing the cleaner to sit for several minutes, wash the concrete with a pressure washer at about 2000-3000 psi. Hold your tip a couple of inches from the concrete, move back and forth keeping your nozzle the same distance away from the surface. Wash at a nice steady pace but move slowly enough that you get a good clean even look. If done right pressure washing driveways can really add curb appeal to your home.
Be careful when cleaning around the edges of the concrete slab, landscaping and debris can be blown around from the water pressure. Always protect your eyes by wearing safety glasses. Make certain to rinse any plants or shrubbery that the concrete cleaners may have gotten on.
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