I wash the flasks that only have had water in them, mostly in water. I always use the same flasks for electrolyte solution (I don’t use liquid calories for ultras). The others get a rinse through with some Fairy/water etc. Tops get a soak.
Every now and then a soak with a Milton tab. I use wooden spoon handles to hold them open until dry.
The vests and belts just go in the machine with the other training clothes.
Flasks get a good wash in the sink, rinsed & drained as well as possible before putting in the freezer.
Vest gets put in the washing machine.
Same as this for me. But with less care and attention.
Yeah that’ll be my protocol.
There is however another adult in the house that may shove anything I can’t hide in the dishwasher when I’m not looking, so I’m wondering if that will kill the flasks - particularly the gel flask which is super floppy recyclable something.
The family have been doing their best to destroy my winter steel bidon since they found it, so I hide it in the pain cave when I can.
Mine gets a wash when it gets smelly enough for me to notice it 
I do rinse the bottles after I use them, leave it to my immune system after that 
It’s not the bottles that will kill you, it’s the skank in the valves! 
I did actually take them apart and run hot water through them, then squirt water through them from the bottle to try and rinse the mouthpieces.
I’m still here 
I’m going to add that because there are dangly chest straps & a bit of velcro I put the vest inside one of those net wash bags.