When seasonally replanting, drain the water reservoir from your Trudrop planter before removing all plant material and potting mix from the planter. Once drained, the reservoir can be cleaned with just clear water or alternatively a solution of 1/2 cup hydrogen peroxide to 1 gallon of water can be used. To use the latter, return the drain plug to its position, fill with the solution, swish the liquid around the planter and let sit for 30 minutes, then unplug and rinse with clear water. Here is a quick video on preparing a planter for repotting.