Mr Retreats' Tip - Vaseline Is Your Friend!
In hot weather a smear of Vaseline across your brow just above your eye brows prevents sweat from running into your eyes, nothing worse when you are stepping on the pedals and your eyes are stinging with sweat. It's bad enough thinking about what those legs are going through without adding to it!
On long rides/sportive or triathlons I always pop a dollop of Vaseline under the nose of your saddle. So when you are getting into the latter stages and things may be starting to get tender, or clothing starts to rub you can just reach under your saddle and grab a bit and apply it can be good for your lips as well if they are getting dry.