C.P. is a special-order item at WM...but
BOAT/US carries it, and it's in their catalog. If the store manager where you shop doesn't stock it, tell him to get it from their warehouse. Alternatively, you can order it from the online store right here.C.P. is the only bowl cleaner on the market--household, industrial, or marine--that can be used with K.O. because it's the only one that isn't a "germ killing" chemical product...it's a bio-enzymatic cleaner. And btw...it's not just for toilet bowls...it's the best cleaning product I've ever found for drains and sumps. The enzymes "eat" soap scum, grease, hair, etc...a squirt or two each week keeps drains running clear and sumps clean and sweet-smelling.