methods for gum and motor oil

[stevenf]

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?
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[Mike B.]

Hot water is a must, melts gum off concrete with out damage.

[stevenf]

Originally Posted by Mike B.

Hot water is a must, melts gum off concrete with out damage.

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?
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[Everett Abrams]

Hot water is a must

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.

[JCinNJ]

for concrete work, more GPM the better

[stevenf]

Is it better to sacrifice gpm and psi for a cheaper hot waters setup?
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[rlitman]

Originally Posted by stevenf

Is it better to sacrifice gpm and psi for a cheaper hot waters setup?
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Most people would advise that, yes.

[Roof Cleaning Virginia]

Originally Posted by JCinNJ

for concrete work, more GPM the better

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.)

Your thoughts please?

Thanks!

[stevenf]

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....
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[mownredneck]

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.