In my experience, it's a function of the environment in which the toilet lies. A toilet in a quiet underground car park is almost guaranteed to be more disgusti

In my experience, it's a function of the environment in which the toilet lies. A toilet in a quiet underground car park is almost guaranteed to be more disgusting than a toilet in a well-lit, busy concourse. I've used pay toilets that are pretty disgusting, too; never thought to ask for a refund, though...