If they're sanke kegs there are lots of videos around showing how to empty clean and fill sanke kegs.
I don't have one and haven't tried but from reading around in the forums I believe all you have to do is release the pressure first. I think most are using a screwdriver to depress the ball in the center. Then remove the locking collar again I believe most are using pliers and a screwdriver. Then pull the spear out if the center if the keg. Clean. Sanitize. Refill. Then reverse the process to seal the keg back up.
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