Castrol Techniclean MP Flex (previosuly called Flexiclean) is a heavy duty alkaline cleaner that effectively breaks loose hardened deposits of chips and swarf, and readily removes oily residues, gummy deposits, grit and dirt from interior and exterior machine surfaces. Techniclean MP Flex is particularly well suited for coolant system cleanouts, yet it can be used in immersion, general maintenance and spray wash applications.