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Old 02-10-2012, 04:49 PM   #1
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Stone Fireplace Hearth


Hello,

We are trying to determine what kind of stone this is on our hearth (see picture). We need to know so we can clean the surface of a white residue that came from our humidifier.

We have tried straight vinegar and soap but nothing will remove it. Can someone tell us how to get that residue off of the hearth?

If not, once we find out what material it is we were going to try something more specific to that material.

We are not sure how to proceed so if you have any suggestions please let us know.

Thanks,

Randal
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Stone Fireplace Hearth-test_fireplace_small.jpg  

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Old 02-11-2012, 11:41 AM   #2
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This is never easy on the internet, so I wouldn't be suprised if I was incorrect, but it looks like thermaled Bluestone to me, which is a fairly common product, especially in the NE.

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Old 02-13-2012, 04:39 PM   #3
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Stone Fireplace Hearth


Thanks for the response. I have looked at bluestone but I am not sure about the other word you mentioned "thermaled." What does that mean?

Thanks,

Randal
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Old 02-13-2012, 10:38 PM   #4
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Originally Posted by sharingsunshine View Post
Thanks for the response. I have looked at bluestone but I am not sure about the other word you mentioned "thermaled." What does that mean?

Thanks,

Randal
"Thermaled" means that it's been cut on all 6 sides and they have been subjected to a torch flame to produce a "rock-faced" edge. It is a consistent version compared to typical Bluestone "flag" that comes straight out of the ground in layers.
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Old 02-16-2012, 10:18 AM   #5
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Stone Fireplace Hearth


Thanks for the explanation. Now, do you or anyone else know how to clean the mineral deposits that were left by the humidifier?
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Old 02-17-2012, 10:42 AM   #6
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Stone Fireplace Hearth


I would try contacting Prosoco directly to see what they suggest, they've been really helpful to me in the past:

http://www.prosoco.com/Contact

If you want to try something household first, you shouldn't have a problem using a mix of vinegar and water as long as you apply it to the entire surface to avoid spot-staining.
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Old 02-17-2012, 04:17 PM   #7
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Stone Fireplace Hearth


vinegar and baking soda may remove it? maybe pumice powder?
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Old 02-17-2012, 05:18 PM   #8
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Thanks for the suggestion we have emailed Prosoco.

Regarding the vinegar and baking soda how would you suggest that be used?

Thanks,

Randal
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Old 02-17-2012, 05:37 PM   #9
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"regarding the vinegar and baking soda how would you suggest that be used?"

mix into a paste, use semi stiff bristle brush in circular motion. toothpaste can remove water marks from fine wooden surface also.
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Old 07-25-2013, 12:30 PM   #10
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Stone Fireplace Hearth


Attached is a pic of my fireplace hearth. The same material is also on my front steps and the pressure washer cleans it up nicely but for obvious reasons I can't bring it in. Any ideas on cleaning the hearth before I start on some of the above suggestions? Sharingsunshine: Did Prosoco provide you with a solution and how did it work?
Stone Fireplace Hearth-img_0083-1-.jpg

Last edited by mpnret; 07-25-2013 at 12:32 PM.
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Old 07-25-2013, 12:46 PM   #11
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No, we never got a definite answer. They said to try a few items they might work. So we have just accepted the discoloration for now. If you find something please let us know.

Thanks,

Randal
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Old 07-26-2013, 05:11 PM   #12
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its probably accumulated dirt, wood ashes, & grease/oil from bare hineys sitting on it,,, you might try some ' goof-off ' or lestoil,,, they might not work but won't hurt it,,, others might consider it patina much as the pencil marks on the door where we chronicle the growth of our children
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Old 07-26-2013, 08:20 PM   #13
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Actually, it is from a steam vaporizer that was sitting on it and sputtering the water out intermittently.
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Old 07-27-2013, 01:46 PM   #14
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Quote:
Originally Posted by mpnret View Post
Attached is a pic of my fireplace hearth. The same material is also on my front steps and the pressure washer cleans it up nicely but for obvious reasons I can't bring it in. Any ideas on cleaning the hearth before I start on some of the above suggestions? Sharingsunshine: Did Prosoco provide you with a solution and how did it work?
Attachment 74167
That one looks to be Indiana Bedford stone, an extremely common stone here in the Midwest. I would try finding a small orbital sander with a vacuum attachment (or have a second person present with a good shop vac) and try sanding the top lightly. Bedford is relatively soft for stone, and sands relatively easily........

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