Concrete Cleaner - Super Concrete Renovator ( SCR) 1 Gal Super Concrete Renovator ( SCR) 1 Gal . Packaging: 1 gal (3.8 L) jug OR 5 gal (18.9 L) pail 1 Gal SCR (Super Concrete Renovator) concrete cleaning solution. SCR is a penetrating concentrated renovator for concrete and cement-based products. It quickly dissolves mortar, scale, rust, algae, stains, and mineral deposits such as efflorescence. Mixing ratio. Varies by application: no dilution to 4:1 (4 parts water to 1 part SCR). Coverage. Varies upon substrate: 150 ft2 per gal (14 m2 per 3.8 L)