I know you tip when your meal is delivered, but do you tip again when the dishes are cleared? I saw some dirty dishes in the hall by the door waiting to be cleared away.
Is this the correct way to return the dishes, or do you call room service and ask them to come get them?
No, just tip when the food is delivered. The cabin attentants will take all the dirty dishes when they come by and pick up cabins. I just usually leave the dishes in the cabin anyway, they are always taken care of.