A brushless car and truck wash. Use at higher concentrations for road film, bug and tar removal. It is formulated to penetrate stubborn soils without degrading a vehicle's wax finish. A more concentrated version of RB 2000 for truck wash professionals who have excellent control over dilution ratios. RB 4000 is a unique proprietary blend of surfactants, wetting agents, water softeners, and builders. In simple terms RB4000 packs a powerful punch to remove the most stubborn road film, bugs, and grime.