Milton cold water should be fine
If you boil they will need to boil for at least 5 minutes to be sterile. I always just used the milton
Milton wipes.
Boil them x
Dishwasher
Just use Milton wipes
I use Milton wipes. And occasionally chuck them in the steriliser. I also found microwave steriliser bags quite handy too.
I always use Milton for everything 😊