What is the best way to talk to a new housemate about his poor hygiene habits when the guy thinks he is clean?

Tell him your aim is to keep the bathroom clean and his aim would be a big help. My aim is to keep the bathroom clean your aim would be a help. If you sprinkle when you tinkle be a sweetie and wipe the seatie. Guys stand a little closer, it's shorter than you think and Lady's please stay seated for the entire performance.