The pre-wash detergent "slot" in my dishwasher is a slight depression labelled "Pre-wash" on the flap of the normal-wash detergent dispenser. In other words, ju

The pre-wash detergent "slot" in my dishwasher is a slight depression labelled "Pre-wash" on the flap of the normal-wash detergent dispenser. In other words, just squirt a bit of detergent into the dishwasher (anywhere, it doesn't matter) before running it.