Device and method for cleaning a wellbore equipment

A method for cleaning an equipment arranged in a wellbore of a subterranean formation using an electrical discharge generating device in order to improve the recovery of formation fluids and/or gases, said electrical discharge generating device comprising a discharge unit for generating at least one electrical discharge that propagates at least one shock wave for cleaning said equipment, wherein, the device comprising a retaining module configured for retaining a volume of liquid in order to immerse the discharge unit, the method comprises the steps of positioning the device next to a wellbore equipment, filling a liquid in the wellbore so that retaining module retains a volume of liquid in order to immerse the discharge unit, and generating at least one electrical discharge into said retained liquid that propagates at least one shock wave for cleaning said equipment.