I take four pipes with me to an event of a a trek. I have ten smokers at home. No matter tween clay and best brier a pipe needs to rest and dry several days between smoke days.Yes to cure a clay pipe that has absorbed too much juice from the tobacco, you indeed simply lay it on hardwood coals. USE TONGS to remove it after a few minutes and lay it aside where it may cool as a clay pipe even when it isn't glowing with heat may still be hot enough to take skin off you. Besides the heat from the fire will likely require the use of tongs to get close to the coals, anyway.
BEWARE that you do this to a pipe that is a full day from being last smoked. IF you smoke the pipe, then decide it's time to cure and lay it in the fire, moisture from the tobacco will likely still be in the ceramic of the bowl, and when it turns to steam the bowl will burst.
LD
Laid on the fire to clean a wet bowl can burst as said.
Undried, if you had a smoke around the camp fire and laid it aside, then in the morning you want a bowl you first puff will taste like the mother of all nasty old ashtrays you ever smelled
Break out a clean one to greet the dawn.
A rags end can be twisted in to the bowl to clean it and should be done regularly