I use a wet sponge most of the time but use the curly brass once or twice a day to give it a better clean.
I don't have to pay for my tips myself so I am not as worried about damaging the tip too much.
It also depends on the quality of the tip and the coating on it as to how it stands up to the brass.
Another important thing is not to use a harsh flux
I voted wet sponge as I use that the most
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