Lulumama - I can just imagine the colour of the air around your DH
So, nearly 2.5 hours solid, 1 roll of kitchen paper, 1 roll of toilet roll, 1 broken knife, i pack of wipes, 1 dishcloth and 2 decent blisters later I have managed to get it almost back to normal! I have just taken a break to make tea so I have covered it with wipes in the hope it will stay wet enough to have another go later on <sigh>
And the moral of this story? If you have 4yo dc, who love to help, make sure you do not mention that the tin of paint needs to be put away later
Thank you for your replies everyone! I would probably have thrown up my hands and called it an impossible job if you hadn't all given me hope that it could work!