Can I put dishwashing liquid in my spa to clean the pipes? Holly June 13, 2018 00:11 Updated Follow No, this will affect your water quality and cause problems with your spa, including excessive foaming. We recommend using Spa Pipe Degreaser. Related articles How do I raise the Alkalinity and PH level when using a chlorine free system? Can I empty half of my spa water and refill to keep the water longer? When should I change my Spa Water? Comments 0 comments Article is closed for comments.