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Unread 04-10-2019, 01:28 PM   #3
Commercial Cleaning and Maintenance
Join Date: Apr 2004
Location: Arlington, outside Boston
Posts: 793

Manmade tile or natural stone?

Try 50/50 bleach and water spayed on so it has 10-15 minutes of soaking time.

If that reduces the marks dramatically, then it was mold stains. Pretty common in this setting.

Post afterwards so we can follow up.

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