Depends on the who, what and where.
On a solo trip, or a trip with a companion where we are not sharing meals, my “dishes” are minimal; a spoon, a cup and a coffee mug. The cup is used for oatmeal or grits in the morning. When empty of every scraped clean morsel I dump a little hot water (or hot coffee) in the cup, stir/swish it around, Conk drink it, wipe down the inside and lick the spoon.
Instant Via leaves no discernable grounds in the coffee mug, and at best I might give the mug a rinse every couple of days. Or when I get home. OK, I also use a sharp knife for cutting cheese or cured meats, and a plastic knife for spreading peanut butter or etc; I wipe ‘em down and call ‘em good.
Lunch creates nothing but a knife blade or two to clean. Dinners are MacGrady style, although I only eat half a Mountain House meal at a time and reuse the bag for the next day. Wipe down is usually a scrap of toilet paper or an instant oatmeal/grits packet, which goes in the Ziplock burn bag for the next fire.
On family trips we do a little more actual cookery, and may have a pot or pan and more utensils. We bring a collapsible bucket, half a scrubbie sponge and some Campsuds (which works OK in saltwater, some soaps do not, Dr. Bronner’s just makes soapy globules).
Grey water disposal depends on where we are, although on river or tidal trips it goes back in the river or bay. On lake trips I am sometimes leery of grey water disposal directly in front of camp, especially on group feeds where there may be grease or scrubbed off food bits left floating along the beach. I’d rather not have food odor rimming the launch. Same concern with cat hole or firepit disposal; not so much a lions and tigers and bears oh my concern as not habituating mice, chipmunks, squirrels and raccoons to a campsite feeding station.
I am more cautious on group trips with different folks sharing cooking (and cleaning) chores. Sharing cooking/cleaning is one thing, sharing gut flora is another; scrubbie (maybe both halves, one half for grease, one half kept cleaner) wash bucket with Campsuds, rinse bucket with bleach.
Friends that guide are anal about cleaning dishes. Different intestinal flora available, and a client with the squirts probably isn’t a happy camper. Or tipping well at the end of the trip.
In all seriousness contamination issues stem mostly from a lack of proper hand washing before meal prep or cleaning, and I’m only responsible for washing my own hands dammit. I do bring hand sanitizer in the TP bag, and hope any companions feel free to use it.
I have been suddenly and dramatically hit with intestinal distress on one trip. The drama was that it hit, with urgency, at 3am on a desert river trip. I had been late into camp the night before and not felt the need to set up the portable wag bag toilet. Eh, it can wait ‘til morning.
Waddling hurriedly around in the dark with clenched sphincter trying to set up the toilet was not fun. Less fun was that I came within inches but didn’t quite make it fully seated. It was a disgusting lesson learned.