In reply to Chris H:
> While the chipping is bad from a climbing point of view, the "real mess" from a non climbers point of view would probably be all the chalk smothered over razor roof.
Yes. At least in theory this could be brushed off. Unfortunately in practice it either isn't, or can't be. I did Razor Roof a few weeks ago and it was smothered then, and it also had huge tickmarks on it. I brushed the tickmarks off, but the rest of the chalk was pretty well bedded in and with the rock being quite soft I didn't make much effort to clean it up.
I wonder with the current popularity of bouldering whether we shouldn't all be making more effort to use less chalk, particularly on something steep where it won't wash off.