I have a small bottle saline and all is wrapped in a towel so can put over a sink in a public toilet. I know the surface is clean and the lens will not bounce onto the floor or go down the plug hole!
In the car I have removed the rear headrest to gain access to the parcel shelf to perform lens care duties. The towel soaks up any solution from rinsing the lens through thoroughly. All this is in a carrier bag I keep in my little back pack.
Andrew, was the space under your hat taken up with marmalade sandwiches?

