Pre wet floor and apply Aqua Mix Heavy Duty Tile & Grout cleaner then allow to dwell, scrub with Mono Rotary fitted with soft to medium brush and agitate. Vac up, rinse thoroughly and vac again. Then seal with appropriate sealer. My choice is always Aqua Mix Enrich N Seal in the case of Terracotta gives brilliant protection and a deep wet look finish with easy maintenance.
Kev Martin
Tiling Logistics Ltd