The first true concentrated cleaner! 4U may be diluted up to 32 times and still retain 99% of its cleaning efficiency. It replaces solvents, caustics and acids, and still cleans almost anything from fabric to engines. Combo packs (CDC) include 4U concentrate, with a built-in dilution scale and a handy trigger or pump spray bottle. 64 parts water: Great washdown soap. 32 parts water: General purpose cleaner. 16 parts water: Oil spots, awnings. 10 parts water: Black streaks. 3 parts water: Engines.