Cleaning concrete floors before sealing is the most crucial step in ensuring long-term adhesion, stain resistance, and surface durability. The process starts with removing loose debris through sweeping or vacuuming, followed by eliminating oil, grease, and contaminants using a high-quality degreaser. Any paint, glue, mastic, or old coatings should be removed mechanically or with safe chemical strippers. If the concrete is dense or non-porous, the surface must be...