Lime streaks occur primarily during new construction when CMU grout cells are exposed to inclement weather cycles. This weather pattern dissolves the free lime in the mortar, as days pass the CMU wall dries at the surface, the free lime then migrates to the surface of the CMU block and forms crystalline lime run.

Lime run streaks cannot be removed with water, soap, or brushing and sand blasting is highly destructive to all masonry surfaces. Bielski employs a chemical process to remove the lime run while leaving the block with the original appearance intact.

AFTER: Beginning to remove the lime streaks