Use a spinner tip and you won't need any chemicals. However, if it is really bad, and a spinner tip wont get it, use a product called "Green Demon" from Cougar Chemical.
With a power washer and a little patience.
Yes, there are chemicals used to clean in pressure washers. You can rent a pressure washer and the cleaner at Home Depot or Lowes. You can also buy just the cleaner at walmart, lowes, or home depot.
The first step to cleaning concrete is to clean the dirt as much as possible. Sweep the ground with the help of a broom. To get rid of sticky dirt, get a pressure washer and use it to wash heavy stains. Next, turn on the power washer. Adjust the amount of pressure to remove the sticky dirt, dust and grime. Spray throughout the concrete and focus more on the dirtiest parts. Apply pressure as needed and once you are done, allow the concrete to dry off to see the results.
Pressure washing is the best technique to clean an open and large area like driveway, roof, deck etc. One can perform pressure washing on their own by following some safety tips or they can hire professional driveway cleaning services and ask them about after cleaning maintenance as well.
With so many to choose from, it's hard to say which is the best. I'm going to go with the reviews on the product and say that you may want to try the Homelite 2500 PSI Gas Pressure Washer.
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Pressure washer :)
a presure washer is the best way to clean concrete, keep in mind to keep moving the presure washer and not let it just set in one spot for to long.
Give it a good pressure wash, not will it only remove the paint mark but will also remove the accumulated dirt on it. Use a pressure washer surface cleaner from bestcargurus to do clean it faster than a regular pressure washer wand and nozzle
There are plenty of deck and patio cleaners on the market, my choice for you would be the prox patio and deck cleaner it is a green cleaner no toxins whatsoever.
A pressure washer can help you quickly clean large areas of all kinds of surfaces. You can pressure wash a home, commercial building, concrete, patio, wooden decks, and so much more. This is done using an electric pressure washer that sprays out a special mix that is designed to not only clean the surface, but help protect it as well. Knoxville Pressure Wash provide full pressure wash services for home, residential and commercial buildings in Knoxville, TN to have House Pressure Washing, Driveways & Sidewalks Cleaning, Graffiti Removal and Roof Cleaning. Call at 865-448-4291 or visit knoxvillepressurewash.net now.
A pressure washer if Miralax isn't available