Learning Chinese isn't easy and if you want to really improve your reading skills, you need to take every opportunity to practice you get, even when using the toilet.
Apart from the ubiquitous 向前一小步，文明一大步 (the title of this blog entry), there is also a handwritten note. I still find messy, handwritten Chinese quite tricky and can't quite make out some of the words here. This is as much as I could read at first:
After a little thought, I'm pretty sure it's saying 泡糖不要吐在小便池里 (don't spit out bubble gum into the urinal), but the 不 looks more like a 又 to me, and there also seems to be a small additional character between 泡 and 糖. Can anybody confirm?