Chipps says in his review of the baa Baa base layer that you shouldn't polish your glasses on Merino. "just don't" is the advice.

Why? And I ask because I don't want to try it!

wool fibres are harder & stiffer (even the finer merino) than a soft microfibre cleaning cloth so might scratch the lenses?

Is that it? I was at least expecting flames with the doom mongering.

I still won't mind you.

It's a covert sign that you wish to participate in a spot of dogging in the carpark after the ride.

Then why be covert?

I can confidently back up what no-eyed-dear says, and I'm fairly sure that that was what Chipps was subtly trying to warn us about – If somebody does it at the side of you, it means they want to touch you where you wee. It's a minefield I tell thee!