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Roadside rock exhibits exhaust spooge, sacrebleu! 12-Jun-2012 At 11:40:25 AM arniearms

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There's a sneaky bouldering rain cave next to a busy road on the Sydney Northshore, rock good, climbing good, spooge bad.

Rock is mostly very solid, smooth slopey ledges. The problem is the rock is covered in exhaust particles that leaves a greasy feel to the rock.

With all this rain lately I was thinking of spending a few hours cleaning up problems.

Has anyone tried cleaning product on rock before (in this case to remove road grime), I dont think just plain water will work in this case as the grease is a build up of layers over many years.

At the moment I can think of 3 cleaning options:

* Dishwash
* Floor cleaner (eg earths choice grey water safe)
* Carwash (non waxing)

Strategy would be using minimal detergent, maximum elbow grease, a sacrificial towel and rinse thoroughly with water when finished. I just want the rock to be nice and clean afterwards and not trash the environment for other future generations to enjoy (haha, probably as an extra lane for their car).

Anyone tried anything like this? Alternatives etc...