Well, if you locate paper towels or a few pieces of toilet paper upon entering the restroom (I fold some up and place under my chin) turn off the faucet with it after washing my hands that is one way I ensure I don't contaminate my hands on the faucet. I then use the paper towel I dried my hands with to open the door. I would also use a few pieces of toilet paper to open the door with if there are only air-dryers in use.