Q. How can I remove white stains from rubbing alcohol dripping on my saltillo tile? The tile is sealed but the sealant probably needs to be redone. 

A. The alcohol has removed the existing sealer. The best thing to do is to strip the existing sealer off and reapply. However, you need to determine what type of sealer you currently have to pick the proper stripper. If you don't know, you may want to have a professional make that determination. For information on finding a professional in your area, contact us.

Fred Hueston
Chief Technical Director, SurpHaces
President, Stone Forensics