Hi there. I have a 2018 spark 3up and winterized it last fall. It was suppose to be stored inside all winter at an uncles house. I picked it up, brought it home, and noticed it was full of water on the inside somehow. The battery was about 3” underwater. I took the top off and looked in the air box and it’s dry ( but it has a drain hole in the bottom anyhow). I changed the plugs and battery and tried to start it. It turned over and started but a brown nasty water is coming out where the water normally exits the bottom. It’s very dark brown and smells like sewage. I can’t tell if it has oil in it or not. The oil in the jet ski is at the normal level and looks normal. I don’t know if the water was in it all winter and froze or if it happened in the spring when he put it out. Does anyone have any ideas what this nasty water is?