Slate shower tiles with white .. stuff ..


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Old 12-12-20, 11:32 AM
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Slate shower tiles with white .. stuff ..

Pictures: link, link

There's this white/green powdery stuff on my shower tiles that I can't figure out how to clean off. I've tried:
  • lime-a-way spray
  • kettle descaler (durgol)
  • grout haze remover
  • stone & tile intensive cleaner
  • stonetech acidic cleaner
If I scrape it with a razor, a light green powder comes off, but it does leave scratches and also the slate flakes off... so I stopped. It seems like limescale, but when I use the lime products above the surface does not bubble or fizz. Maybe it reduces it by a shade of white with some scrubbing, but I could just be fooling myself. When it gets wet, you can't really tell it's there.

So, what is this stuff, and how do I clean it off?
 
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Old 12-12-20, 02:03 PM
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Unfortunately your picture does not show anything distinguishable. Try using a white sheet of paper on the tile and scrap a small sample on the paper.
 
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Old 12-12-20, 02:24 PM
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It sounds like you have been thorough in your cleaning efforts and since you tried so many products and still have the stuff, I've got to assume that it's nothing on the stone that you can clean off. Slate isn't a great stone for a shower. It's soft, porous and can have all sorts of stuff in it (it is just half a step away from being mud). I'm wondering if it's some mineral in the slate that's reacting with the water & soap.
 
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Old 12-12-20, 03:17 PM
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Here is some of it scraped off onto white paper: link.

The pattern of white matches basically where water would drain, so it is likely something to do with the water or soap as you suggest.
 
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Old 12-13-20, 05:20 AM
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Your link isn't working._______________________________________
 
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Old 12-13-20, 10:18 AM
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Second try: link (not sure how to edit the post)
 
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Old 12-13-20, 10:23 AM
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As PD says I think it's the stone itself. You might try a water repellant sealer. Maybe Thompson's water seal? Not sure that would good for a shower floor. Admittedly I'm at a loss.
 
 

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