I have been using an old dead dishwasher for 2 years to dry roughed out bowls, etc. Just put a 40 or 60 watt bulb in an outlet such as an old lamp or a fixture lke we used to hang under the hood of our cars when working on them at night. I took out some of the fingers of the dryer racks to give me more room for bowls. bowls usually go in top rack, light in bottom rack. Plug in lamp, turn on lamp, close door, wait, check bowl. I usually write date on bowl and rotate it about every third day. You can also weigh on kitchen scales, record weight, let dry 2 - 3 days, weigh, record, let dry until two consecutive weights are equal. Bowl is dry. This technique has even closed cracks that were beginning in the bowl when I put it in the dryer. Dishwasher is already vented so you just need a heat source.