The measuring and dispensing device of the reusable type for the machine washing of clothes comprises a hollow body intended to receive the amount of a liquid detergent prescribed for a wash and provided with at least one filling opening (3) and with outlets (8) for distribution in the machine, as well as means (2, 2a; 10, 10a) enabling the user to effect, once said device has been filled, an easy and controlled application of detergent to selected areas of a garment before the latter is washed in the machine, in order to effect a pretreatment of said areas before the washing cycle, the measuring and dispensing device, still containing the amount of product remaining after the pre-treatment, being introduced together with the clothes into the machine. Said pretreatment means (2, 2a; 10, 10a) form an integral part of the device.