On Fri, 09 Sep 2011 17:49:16 -0700, bill jensen wrote:

wow! Is there anything that will remove it? I've tried bleach,
cleanser and even Goof-off with no luck. I think a wire wheel may do
it, but it's a broom finish and i don't want to knock that off and leave
smooth area. fyi, the slab is just 3 days new so I've been holding off
on acids.

Any ideas appreciated.

water

time is on my side