I also have Obessive-Compulsive Disorder so this provides endless entertainment for my S.O. and for my co-workers.
The invention of purell made things a lot easier. Here's the ritual I go through each time I use a public restroom:
1. enter rest room and get paper towel from towel dispenser.
2. wash hands
3. use previously obtained paper towel to dry hands, then use same towell to turn off the water faucett.
4. enter bathroom stall, using toilet paper to close the latch on the door
5. Use toilet paper to make sure that the seat is dry. Then cover the toilet seat with either a seat cover if they have them there, if not, use toilet paper. Then answer the call of nature, when finished, open bathroom door. Then use foot to flush the toilet, taking care to immediately back away so that the arisoled toilet water doesn't get on me.
6. get clean paper towel from towel dispenser
7. wash hands, then dry hands using towel gotten from step 6. Then turn off faucet with same paper towel.
8. use paper towell to open door to bathroom, discarding paper towel in nearest trash barell.
(restrooms with those automatic soap, water, and towell dispensers and auto-flush toilets eliminate a few steps.)
I can justify that my OCD in that case is actually a good thing, because since I have started working at my place of employment, most of the women there have adopted my ladies-room rituals. LOL!