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Black slate tiles always look dusty

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I have black natural slate tiles in my bathroom and they constantly look dusty. The only time they look good is when they are still wet just after I have cleaned them. As soon as they are dry they back to a grey dusty looking tile.
When they were originally laid the tiler did put a sealant on them and they were ok for a while but not long.
Please can anyone recommend any products or anything I can do.
I have tried star drops, washing up liquid, flash, down on my hands and knees etc to no avail.
When they were originally laid the tiler did put a sealant on them and they were ok for a while but not long.
Please can anyone recommend any products or anything I can do.
I have tried star drops, washing up liquid, flash, down on my hands and knees etc to no avail.
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not sure how long they have been down, but if they are new then it could be a bad grout job, washing would just then spread the grout film around which shows again when dry. You need to clean this off before sealing again, you usually need a mildly acidic cleaner such as lithofin cement residue remover
2-3 coats of Lithofin slate seal applied when the floor is clean and dry will leave a slight wet look, everyday cleaning use lithofin easycare (this looks expensive but lasts ages!).
But I have been wondering about slate floors, as I have the same problem for something more long term. I'll be watching this with interest.
:cool:
Incidentley I did spill a little baby oil, wiped it up and that tile looks great, but worried that it may all become a bit slipperey if spread all over the floor.
I will report back:)
there are specialist products that will achieve what you are aiming for on a long lasting basis
But not sure if its OK for floors to walk on as it can be a bit oily.