I have a small cut on my head and want to clean the area, what is best to use, regular shampoo?

Any soap and water. Remember, soap and water never hurt anyone. It is always a good idea to keep wounds clean. Shampoo would be just fine for a cut on the head.
Soap and water... ...Followed by your regular shampoo should get the job done. Have you had a tetanus shot in the last 5-10 years?