If they do not know, ask them to find out. Most manufacturers who have switched to CFC alternatives are very vocal about using them. Those who don't utilize CFC alternatives need to know that this is an important issue which concerns environmentally aware consumers. According to Consumer Reports magazine, some manufacturers recommend more detergent than necessary. Use non-phosphate detergents and a little extra muscle instead of harsh and toxic teak and hull cleaners.
Liquid detergents are generally phosphate-free.
Use a substitute for detergent. If your water is soft, soap powder will work as well as a detergent. If your water is hard, you can try a combination of soap and washing soda. Soap also works best in hot water. Use a drop cloth to catch paint scrapings or sweep them up and dispose of them on shore.