If anyone is truly worried about retained water you can just blast with compressed air, place in a convection oven on low, or....
Use a second tray filled with the light oil of your choice, set the gun inside, then place tray into the solvent.
The U/S waves will carry through both fluids and work the oil into all the nooks & crannies.
Hang it up over the tray to capture oil drippings, then wipe down.
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