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Sharkstar
The staining is / was mostly water I think but there is an unevenness to the colour as the stone is quite porous which is why I haven’t used bleach or a pressure washer. Here’s a better picture.
I’ll try another go with the chemical cleaner tomorrow, thanks. Ideally I’d like to restore some of the colour to the stone before I seal it. Has anyone any experience of using colour restoring like this?