Techniseal® HD Paver Preparator is specially formulated to dissolve tough efflorescence (whitish salt) and remove ground-in dirt (traffic marks, etc.) on pavers, slabs and retaining walls made of concrete. This ultra-powerful formula works deep without discolouring or damaging the surface. HD Paver Preparator brightens up the colour, cleans evenly and enables sealant to better penetrate the material. Techniseal® adaptable Exact Sprayer (sold separately) makes application easier and quicker.