R.E.D. features a safe but aggressive blend of grease cutting surfactants and biodegradable solvents which clean grease, carbon, varnish and baked on grime from a variety of auto surfaces. R.E.D. is our most popular degreaser. It easily removes grease and grime, yet will not stain paint or harm aluminum engine components. It is less Caustic (aggressive) than Hurricane, and contains more emulsifying surfactants to dissolve grease and allow it to be rinsed away. R.E.D. is very concentrated. Many customers claim it to be the best degreaser on the market.