Removing clay stains from asphalt

Watch it with that HCL, you don't wanna be splashing it all willy nilly with a pressure washer if you can help it, and you don't want it getting into your lawn, I don't think grass cares for acidic soil, so make sure you rinse it with a hose into the gutter before you pressure washer. It evaproates pretty fast in ambient air so it's not that dangerous, especially the hardware store variety, but it still pays to be careful.

HiTech said:

As for a Karcher brand pressure washer, those are junk.

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Objections your honour!

You'll purchase Kärcher junk in the price class of 30€. I've been using a middle class Kärcher to remove the moss off the garden wall for years without complaints.

If you use a very high pressure washer to wash your car it will be ready for a new paint job.

Boncuk

Boncuk said:

Objections your honour!

You'll purchase Kärcher junk in the price class of 30€. I've been using a middle class Kärcher to remove the moss off the garden wall for years without complaints.

If you use a very high pressure washer to wash your car it will be ready for a new paint job.

Boncuk

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Objections over ruled!
Removing moss from a garden wall can be done with an ordinary garden hose' tap pressure when done properly.... I just removed some moss from landscape blocks Monday evening. One would never use "very high" pressure to wash a vehicle... that's simply stupid on the owner's part. A fan spray is adequate and safe for not removing decals, vinyl strips, etc. Now degreasing and descaling the under chassis can be done with high pressure provided sensitive areas like rubber hoses and such are avoided.

So what are you defining as Very High pressure?
I built my pressure washer with a 3030 comet pump and a 7.5 hp 3450 RPM electric motor. The gauge reads 2900 psi and the flow rate is 3 gpm.

I commonly hook up to my boiler and use 190 degree F water for bad grease removal and it does a super job of removing ice from my vehicles in the winter!
I have been washing my vehicles and equipment for years now with it and the only paint trouble I have is on stuff with bad quality paint jobs. Typically stuff that was repainted with spray cans or stuff that has been repainted where the painter just sprayed right over unprepared surfaces.
If the paint job is crappy or the quality of work done while painting is bad then its only a matter of time before the paint is going to peel anyway.

And dont assume that just because its a factory paint job its done right! I have a few friends that are auto body specialists and they say that some the factory paint jobs (Ford, Chevy, Chrysler, John Deere ) at times are of lower quality than if a person had done it with a spray can!

But I would try pressure washing the asphalt myself. I doubt it would take all that much pressure to work the clay out. I often use my pressure washer to remove grease and oil stains from concrete and get great results.

tcmtech said:

I commonly hook up to my boiler and use 190 degree F water for bad grease removal

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Your running that hot of water through the pump? Is a 3030 comet pump designed for hot water? Most pumps don't like hot water through them.

I broke down 2 years ago and bought a 4000 psi kero/diesel fired pressure washer. Haven't regretted that purchase for a second

The stock themal bypass was set at 160 F. So another 30 degees is not that much more.
I did rebuild it with high temp O rings and seals and I run full synthetic oil too.
It has never had a problem and that has been with many many running hours!

190 degrees F is not any hotter than that of a hydraulic pump in a heavy use application. And the comet pumps are nearly identical in design to some axial piston hydraulic pumps. That was my theory and it seems to be holding true!

I would like to build a high pressure steamer system some day but I cant really justify the cost or time for what little I would need it for. The hot water method works well enough for me.

I did have this originally set up as a gas drive but the engine wore out and by changing it to electric I can just flip a switch to clean stuff.
Plus being 240 volt now it greatly reduced the 'can I borrow it' factor!

tcmtech said:

I would like to build a high pressure steamer system some day but I cant really justify the cost or time for what little I would need it for. The hot water method works well enough for me.

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I went down that route before I bought mine. I had some of it worked out in my head, but chickened out when it came to trying to build a high pressure heat exchanger. I was worried about having something explode if the steam pressure got to be too high. I don't know anything about steam pipes and couldn't find much useful info.

tcmtech said:

Plus being 240 volt now it greatly reduced the 'can I borrow it' factor!

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Haha, I like that. I mounted mine (gas powered) in an old horse trailer. I also fit a 150 gallon water tank in there. You can run it for about half an hour between fills. That makes it kinda nice for cleaning machinery thats not parked close to a water scorce. I have even made some money with it cleaning gum off the sidewalk in front of a couple retail stores and bars in town.

tcmtech said:

Plus being 240 volt now it greatly reduced the 'can I borrow it' factor!

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Pure genius.