There are several ways to clean golf clubs. You can spend a little money on golf club cleaning kits that are available at most golf pro shops. And those cleaning kits work well.
Or you can simply gather up a couple household items. What you need is a plastic bucket (unless you're willing to clean your clubs in a bathroom or kitchen sink), a mild dishwashing detergent, an old toothbrush or other brush with plastic bristles, and an old towel for drying.
Step 1: Create Suds
Take your plastic bucket inside to a sink or bathtub. Squirt a little of the dishwashing liquid into the bottom, then add warm water to create suds. Make sure the water is warm, not too hot (very hot water can loosen the ferrule on golf clubs).
You only need enough water in the bucket to cover the heads of your irons.