It took me a long time to figure out the quickest way to empty a soapy carboy. I fill my carboys up about 1/5 full with soapy water to clean them. If you hold the carboy completely upside down and swirl the water inside in a circular motion, it empties fairly quickly. It helps when you can get a hole to form in the water going out of the neck. The soap and the water come out together. Then a quick rinse gets rid of all of the soap.