Cement dust stuck to stone coping.. Thoughts on removal?

[MasterLFD]

Hey all,

So between the deck going in and the pebble install, I got a bunch of dust on the stone coping that doesn't want to come off with a pressure wash. I did a little research and got some ideas but wanted to throw it up here for a sanity check before pulling the trigger. So my thought was to mix 1 part M Acid with 2 parts water. Then wet everything down so I don't etch the concrete in case I get a little over zealous. From there just use a sponge and wipe it on until the dust dissolves.

Does this sound about right? Am I missing anything?

Thanks all!

P.S. here's what it looks like now...

 

[MasterLFD]

I guess no one has come across this yet?

 

[duraleigh]

If that's a new install, the mason should fix that.

Yes, you need to remove it with diluted acid. rinse well.

 

[MasterLFD]

Thanks Dave. Yeah it's turning into one of those finger pointing deals. The mason left it clean but then between the deck guys and the pebble guys, that's how it was left. Rather than mess with that, I figure it would be easier for me just to do it. Besides, we are having our first pool party tomorrow and I want it to look good.

Thanks for the reply.

 

[malcolmb5325]

yeah a mild 10:1 acid solution will clean it up, that is 10 parts water to 1 part acid and always add the acid to the water.