I have heavy black staining under my windowsills that the Diedrich 101 Masonry Restorer wasn’t able to remove. What can I use to remove them?
These are called black encrustation deposits. They can occur under windowsills, soffits, belt courses and other overhanging areas that are protected from the natural flushing action that occurs on buildings. These black encrustations can be removed using the Diedrich 808X Black Encrustation Remover. These deposits can also occur on concrete block, limestone, and sandstone surfaces. A neutralizer will be required to remove the alkaline residue of the 808X. The neutralizer can be the Diedrich 101 on brick and sandstone, 101G on granite and terra cotta, 707N on Limestone, or 960 on concrete.
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