Dare say you have a great many more but I am currently plagued with a problem when riding. Sweat rollling down into the eyes. I always wear a cycling cap under the helmet and this stops the sweat from rolling down the face and into the eyes. If it gets too hot- I just wet it from the water bottle and it will stay cool for a good while.
But listening to Sean on the TDF he came up with one that he uses. A smear of Vaseline above the eyebrows. He also qualified this with saying "Just a smear".In other words not a thick layer.
And Brake and Gear cables. My regular maintenance is to release the cables and washout the inners with WD 40 and then the cables are lightly lubed till the next Washout. My LBS told me to use "Dry" chain lube. It works just aswell and has the advantage of not attracting dust that then clogs up the outer cable.
So what can you pass on to Aid maintenance?