You have to rinse very well. The chlorine based bleach can accelerate aging of the stitching assuming you are also cleaning areas with sewn seams.Zep, works great and its cheap. Of course like all, its a bleach based formula but its the right mix. Works great on scum in the bilge too. Be warned, you will bleach out anything you are wearing the gets dripped on. I've used it for years and suggested it to many of my friends, they all agree, "good stuff"!!!