Prepare a work area by spreading out a towel on a bench or table with enough room to lay out the club and your repair items. A bench vise isn't necessary but can help keep the club steady while you work on it. Use some rags or other padding in the vise so the jaws don't damage the club's shaft.
Use a soft toothbrush dipped in soapy water to scrub the sky mark. Use small circular motions as you scrub. This should remove any light surface marks.
Scrub the club in the same manner with buffing compound, for deeper marks. Buffing compound is slightly abrasive and will remove some of the enamel or paint top coating to smooth out the surface. Usually only a small amount of the coating need be rubbed away to remove the sky mark and it will not affect the finish of the club. Rub the compound in lightly, slowly increasing the pressure to remove the sky mark. A motorized buffing wheel can also be used.
Clean the club with a fresh rag and soapy water to remove the buffing compound. Wipe the club dry with a soft cloth.
Repair any paint or enamel removal, that may be more than acceptable, by using car touch-up paint. This paint is very hard and will help the club better withstand the rigors of play. After carefully applying the touch up-paint using the manufacturer's directions, apply a clear spray top coat over the top of the club to restore the original shine.