Smears on new slate hearth

waom

Registered User
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I have a new slate hearth which has become smeared. Can anyone recommend how to clean?

Should this have happened if slate had been sealed?
 
There is a marble and slate cleaner out there by PLASPLUGS. Its around 20 euro a litre and available in woodies and the like. It works on slate and marble. Can I ask what sealer you used?
 
There is a marble and slate cleaner out there by PLASPLUGS. Its around 20 euro a litre and available in woodies and the like. It works on slate and marble. Can I ask what sealer you used?

It is a new fireplace and I have presumed that the supplier sealed it before delivery.
 
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