Q: What is the etiquette with cycling to work? I have colleagues who leave their sweaty gear to fester on the radiators and it's a bit unpleasant, especially when we bring clients in.
A: The problem isn't one of etiquette, it's one of human nature. There's no point trying to stop people from cycling to work or putting up bossy notices saying 'Please do not leave your sweaty cycling gear on the radiators!!!'. People are leaving their sweaty cycling gear on the radiators because that's the obvious thing to do, and, anyway, what's the alternative? So what you've got to do is provide an alternative - and, what's more, an attractive one.
Somewhere in your office there must be an inoffensive space that could be dedicated to festering cycling gear. It might need another hook or two, and maybe even one of those little heaters that go in airing cupboards; but once the space has been identified and clearly labelled, all else should follow. And clients will no longer have to hold their breath - in itself quite enough to justify any small cost incurred.