It's not really OCD, though. Places like hotel rooms, I just can't take my shoes off because I know those carpets have been tread on by hundreds of people who came in after walking around on streets with gum, dirt and piss on them since they were last cleaned.
It may seem over the top, but it's certainly not just me that feels that way.
Its the same way with handrails. Do you know how many dudes walk into the bathroom, pulled out that weinus, got their hands nice and sprayed with their own piss, then walk up to the mirror, run their hands through their greasy hair, then walk out without washing their hands? I can't touch hand-straps on the train or handrails in public places without washing my hands after with a wet tissue. I just avoid them altogether as much as possible.