Stone Marker Cleaning

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Of course, the overarching principle here is to do no harm, especially with soft Carthage sandstone, and to know when to stop scrubbing. On the side, there are some old stains from tannin, sap or bird poop that we left alone. There is no point to rub much on this soft stone, because its natural wear over time leaves a beautiful grain that we want to conserve, not make smooth. The right chemicals, techniques and soft brushes do the job.