We've got a small log burner with a light grey stone surround.

Every time I open the door to poke the logs, bits of soot fall out and mark the stone when I brush them up.

I'm getting a little worried as the house is rented, so I want to leave it in good condition.

I've tried washing liquid and cream cleaner but they just don't shift the stains.

Does anyone have any good tips that might help. I'm in UK, so products I can get my hands on here would help.

Many thanks.