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How to Remove Sandstone Fireplace Caulk Stain

Q. I have a sandstone fireplace from the 80s; the previous owners had a fireplace screen door on it and they caulked around the door onto the stone. I removed the fireplace screen door and caulk, but it left a stain that I can’t remove. I have used a tsp of vinegar, with no result. I even have tried a steel brush to remove some stone but no luck. HELP!

A. Thanks for your question regarding your sandstone fireplace. We conferred with Stone and Tile PROS’ Chief Technical Director, Fred Hueston, a foremost expert in stone, and founder of Stone Forensics, about you fireplace.

The answer to your problem is to mix a poultice with a strong solvent such as methylene chloride, an ingredient in paint stripper, to apply to the stain. For more information about poulticing, visit our Stain Removal Application and watch the video. You can purchase paint strippers that contain methylene chloride at Home Depot or Lowes. 

Be aware, however, this is a very strong and dangerous solvent, and you may want to consider a professional to do the work. Click here to find a professional stone restoration contractor in your area. 

Either way, let us know how it turns out. Good luck with the stain, and be careful with the solvent if you decide to do this yourself.


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