Thank you @Pete.8 . We asked the man for an off cut. We didn't expect him to cut and dress it ( if that's the terminology) and he wouldn't take a penny. Unfortunately, he died a while back so I want to keep it in reasonable condition.
Some household bleach diluted will be fine, spray it on, leave overnight or two, then scrub off with a scrubbing brush. Usual precautions and warnings when using bleach which I’m sure you’ll know.
Gardening on the wild, windy west side of Dartmoor.
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Usual precautions and warnings when using bleach which I’m sure you’ll know.