I am starting a pressure washing business. One bid is for a fast-food drive thru to have weekly washing. I know gum and oil will be the main concern.
Someone mentioned liquids nitrogen on gum so it will chip off...???
And is there a way to remove oil without etching the concrete? Posted via Mobile Device
I will be using a 3500 Psi 4gpm cold water machine. Any other recommendations for gum and oil? Are there any heaters to install in plastic drums for temporary hot water? Posted via Mobile Device
Couldn't agree more. I would go in the day after a contractor showed up with a cold water washer and show the decision makers the difference. Invest in a hot water washer and you will increase customer satisfaction and keep accounts long term.
JC - can you advise at what point is it diminishing returns with higher GPM machines? I'm recently advised that runoff then becomes an issue, and excessive water usage. (I'm in the research phase of expanding to commercial flatwork as well.)
Well I couldn't make myself invest in an expensive machine so I bouught a 3800psi 3.5 Gpm and it works great! Takes gum off with ease. Removes the top layer of oil stains but I'm beginning to think oil cannot be removed.... Posted via Mobile Device
Get some purple power degreaser and spray it on the oil spots and let it soak in for about 15min, them wash her off, It wont always get all of it up but the majority. Oil stains in concrete that has been there for a while is somewhat of a pain. Hope this helps.
While there is no substitute for heat, there are a few formulations that work to a degree. After removing the excess top layer, a mix of Dawn dishsoap can certainly cut in. It has to be brushed in though, and left to sit. As far as the gum goes,..for real old gum, like on walks, if you do not have a quality turbo nozzle, go from your 15 degree tip to your 0 degree (afterward), and just shake the jetstream on each piece (just a few seconds apiece is all it takes). It comes right up.
Even though hot water pressure washers costs more than conventional cold water pressure washers, you will find that hot water washers make more sense on these kind of jobs. I recommend renting a Hot Water Unit and seeing for yourself.
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