If I have a car wash soap that I want to bring to market, what are or where do I go to get the legal requirements for labeling this product?
You will need to ensure you have a trademark/patent/copyright attorney to ensure you are not stealing someone's or a company's protected formula or label or symbol.  Then you may wish to speak with your local business incubator (they are usually free) about ideas on how to get your product to market. It could be as simple as emails to physically visiting car washes around.