A clean set of golf clubs will help you make better contact with the ball and utilize each club to its fullest. The grooves in your clubs are designed to impart spin to the ball, but they're not effective if they're filled with dirt. It's still up to you to swing the clubs, but there's no sense in making those shots any more difficult than necessary.
If you're working inside your home, spread out some towels or newspaper to work over.
Dip the head of one of your golf clubs into the bowl of warm, soapy water. Letting the club soak in the water for a few moments will help loosen dirt.
Wipe the club head with a rag to remove some of the major dirt and grime. It's not necessary to scrub the club clean, nor does it need to be entirely dry when you finish.
Wet the wire brush or toothbrush with the soapy water and scrub the club. This will remove any remaining dirt. You may need to use a little elbow grease to remove any oxidation.
Rinse the club in the clean water. Then use a nail to scrape out any remaining dirt from the grooves. Rinse and dry the club.
Use the polish on a clean rag to restore the shine to your club. Use another rag to wipe the club clean. You may need to utilize the nail to remove polish from the grooves.
Repeat this process with each club.