Appliance Installation and Repair

We have a very old dishwasher without a manual. Recently we found water building up and trapped in the dishwasher, but we haven't used the dishwasher for weeks. We need a check up of the drain system, then a removal of the old dishwasher. We already have a new dishwasher ready to hookup, please help us install the new one. If possible, please also haul away our old dishwasher.