Small signs on a Czech train (Berlin to Prague) informing passengers not to place trash into the the toilet. I love that they have icons of an apple core, aluminium cans, and I think a toothpaste tube.
Small signs like this often exist in public toilet spaces. A toilet is designed for human waste/fluids. It’s not a trash bin, but sadly passengers have used it as such and train staff had to deal with it. A good example of awareness, or lack of awareness on the part of train participants. What is obvious to some, is not obvious to others.