Our recommendation is if there are only a few dishes (we think something around 5 dishes), it is a nice thing to go in and wash them and leave them on the counter to dry.
If there is an entire sink full of dishes and pots and pans, we recommend that you leave them there as the Neighbor is provided with information on prepping before a cleaner comes: https://lapalopa.com/clean-prep-guide/
We strongly recommend that you never load dishes in the dishwasher or run the dishwasher. We try not to read minds on how people like their dishes to be done and whether the dishes in the dishwasher are clean or dirty.