I use a lightly abrasive brush with soap & water. Sometimes if a bit of stubborn debris won't come out, I use my wife's dental tool to pick it out. Please don't tell her.

I use a non-abrasive brush with warm water. The trick I have learned is when you are all done, grab a can of condensed air that you use for dusting your computer keyboard and blow all the air out where the weights are and at the hosel. It's amazing how much water gets trapped in there and I am not sure it's bad or not for the club. Good luck!

I use a tooth brush. I dip my hybrid in soap water combo then clean scoring lines and weight area with toothbrush