Composite composition consisting of a binary mixture of solvents and surfactants. It is intended for removal of the remains of solutions on a hydrocarbon and synthetic basis from walls of a well and the intrawelling equipment due to fast dissolution and dispersion of the remains of solution and a solid phase at simultaneous change of wettability of surfaces on hydrophilic. Overclean-based detergent composition meets all the requirements for detergent buffer compositions when replaced with aqueous solutions. The reagent is fully compatible with brines.