A dual container concrete mixing transport truck chute washout system with (a) a chute attachable funnel container having an open mouth with an upper rim, an attachment for detachably attaching the funnel container below an exit end of a concrete truck concrete chute, and a material outlet connector to drain liquid and debris from the funnel container, and (b) a truck mountable holding container having an upper portion that is adapted to store the funnel container when the funnel container is not affixed to the chute, a lower portion for collection of fluid and solid materials, a seat located between the upper space and the lower portion, a material inlet connector, and a fluid drain valve for draining fluid from the holding container, wherein the upper rim of the funnel container is adapted to sit on the seat of the holding container to act as a lid.