Been to look at a job today, railway sleepers built up to make retaining walls, edge the paths and sets of steps, unfortunately the "landscape gardener" has used sleepers with creosote and last week in the warmer weather they have leeched tar/creosote - some over the pavers but mainly it's in puddles on the tops of the wood, they are worried as the grandchildren play and sit on them.
Any thoughts on removal/cleaning?
Darran