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
Any ideas appreciated.
As Bob F posted, if depending on the type of chalk it was, the marking
could be there a LONG time.
scroll down & checkout page 48
unfortunately, it looks like the "red chalks" are the longest lived
My suggestion remains the same, leave it alone and it will eventually
I suspect it bothers OP more than anyone else that sees it, especially
since everyone else will assume it just happened. I wonder if rubbing in
a poultice of the dye (in some shade of gray) used for tinting concrete
or grout, or even plain old cement dust or powder, would take the edge
off, or just make it worse? (not advocating it, just curious)
But I mostly agree with the others- sunlight and weather and time, maybe
lots of time, are likely the only real cure at this point.
He already did permanent damage by putting bleach on 3 day old
concrete. The surface will probably deteriorate and flake off where
the bleach was used.
The best solution at this point would be to rip it up and pour new
This is proof how amateurs can destroy something in seconds by doing
something stupid. That chalk was hurting nothing and would have
vanished in a short time just from rain and normal use. Now the whole
job is ruined permanently. Even if the surface does not crack off,
that bleach will show up years from now when the chalk was only a
I got the 'bright idea' to use a chalk line when I was hanging
wallpaper. Some red chalk got the wallpaper and nothing would remove
it. Been there for 12 years now.
Yeah, I know that didn't answer your question but thought I'd share
the experience anyway.
You could try one of those powerful laser pointers. There are some that
will burn paper but I'm not sure how much money you would like to spend
on a new toy that could have any number of unexpected uses. ^_^
simple,Green scouring pad and a little water if it takes more than that th
en use a 120 grit Sandpaper these are stains they don't just magically disa
ppear I've snapped lines that were bogus and tried to cleaning them off min
utes later and they were extremely hard unless you have a little water and
Green scouring pad it works like 400 grit sandpaper and if its been in ther
e for a long time you may need to go a little more aggressive with sand pap
er yeah that takes some elbow grease it's a stain most times when you snap
lines on a slab you want them to be permanentbecause they're usually being
covered up by framing
Get som "barkeepers friend" - apply in a thick paste and cover to
keep it from drying out. Leave it for an hour or so and scrub with a
stiff bristle brush.
That said, a shotgun could prevent having to do it again. Shoot
anyone using red chalk. There is no excuse for using that crap when
blue works just as well and is a LOT easier to remove!!!
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