I followed the advice and set-to this morning with a pack of steel wool and bottle of white spirit. It worked a treat - although it was bloody hard work and took all morning!
As you are swirling the white spirit about with the pad of steel wool, you can 'feel' the bits that are still sticky and require extra scrubbing. You are regularly left with a sticky scum of danish oil dissolved in white spirit that has to be wiped off. I used an old towel cut into squares.
I thought that I had got right down to the bare wood - but it seems that there is still some of the original 'Osmo Oil' deep in the wood fibres. After getting down to what I thought was bare wood, I tried sanding-out some knife-cuts in the wood surface - but the sandpaper clogged up with hard oil in seconds.
The residual oil shouldn't be a problem as I'm re-treating this time with the same stuff.
I'm left with a beautifully smooth and totally matt finish that is now awaiting the arrival of my new tin of Osmo Worktop Oil that I'm advised was despatched yesterday.
My tip for you? If you have ever thought about having genuine beech-block kitchen worktops - DON'T!! They are a pain in the backside! They mark far too easily and require far too much maintenance to keep looking anywhere decent.
Incidentally, prior to deciding to re-oil the worktops, my wife and I investigated a firm called 'Granite Transformations'.
Cheers for the removal advice.
Ret.