Ok so last weekend after I did my water changes life got crazy & I left my hoses out with water in them, about 40 feet of python drain hose is what we are dealing with. Well tonight I was getting ready for tomorrows fish chores when I realized it, how do I clean something that long…. I tired running hot and cold water through it but it didn’t remove what ever is growing in it, some green, brown and black funk. It’s just a drain hose so it won’t hurt anything but I’d still like to clean it up. Ideas, thoughts….. bleach maybe?