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Removing stains from a slate fireplace hearth

We have had a customer contact us today with this enquiry
I’ve finally got my living room finished and the fireplace has been fitted and I’m just awaiting someone to come round and switch on the gas.
But, unfortunately the cat has been sick on the slate hearth and a couple of drops of water have landed on it as well, both leaving a whitish stain.
I’ve tried white distilled vinegar but this has only made it much worse.
I was wondering if this is a problem you’ve come across before and if you have any solutions or suggestions? The hearth hadn’t been sealed so maybe this is the root of the problem. But short of taking the whole fireplace out and replacing the hearth, do you have any recommendations
Now to be honest I’ve not had this before regarding the slate but i did a little googling and found this solution
Sweep the area clear. You are going to be scrubbing the stains, and if you have dirt or grime in the area, then you may just make “clean” mud that will make it difficult to determine if you are actually making progress on the stains.
Mix up your cleaning solution. Combine half a cup of vinegar, half a cup of lemon juice and half a cup of baking soda in the bowl. This should form a paste. If necessary, add a little water or more baking soda to make the paste thick but manageable.
Apply the paste to the stains. Layer on a thick coating of the paste; then lay a damp, warm cloth over the entire treatment. You can leave it there for up to 20 minutes.
Scrub the stains. Using a damp scrub brush, use firm, circular motions to remove the stains. Rinse regularly, since the paste may get in the way when it comes to determining how effective your efforts are.
So I have emailed our customer this advice and we shall see how he gets on with it I really hope it works and the hearth does not have to be replaced I’ll let you all know in time