I just don't understand this. There is nothing
dirty about Universal. The Universal parks are pristine. They do touchup painting on a nightly basis. I have never been in a dirty Universal bathroom. I can tell you that is not the case for Disney's bathrooms. I go to the Universal parks at least once a month and I just don't see this at all. Perhaps you went during one of the night special events. Things do get wild there during those special events. The parks are so crowded at those times that I can understand their being some litter. It's sort of like right after the parade and fireworks at MK. People just toss their litter anywhere. I don't like to go during the special night time events at Universal because the crowds get crazy and too many people get drunk. During the day, however, I never see any trash. I see very clean bathrooms and very well kept attractions.
Sometimes, I think people let their loyalty to Disney color their perceptions.