Very busy at the moment spring cleaning and getting ready to go away.
I was cleaning a fax/phone today and remembered how my family back in the UK used to have a woman come around about once a year to clean the telephone. The rationale behind having a professional cleaning service for a big black phone is beyond me. She was very serious about her job and would set herself up with cleaning cloths and a bottle of something like methylated spirits and give the phone a 20 minute work over. She had a pretend hand piece that was of a similar weight to the real one, and she would rest this on the cradle while she cleaned the hand piece every which way. I must of watched her cause I can see her as clear today in her dark outfit, a bit like a uniform, that she wore. I think the thought was that something you spoke into at such a close range was going to spread germs.
If this was the case I think you might of cleaned it weekly or even daily. But at least we had a clean phone for a couple of days a year, even if it was black and you couldn't tell, we knew.
The most common residues found on escalator hand rails, include snot and saliva. I think there may also be a fluid you wouldn't expect to be outside your pants on there too.
So onward and upward with the spring cleaning clean away the winter residues what ever they may be.