Good call. I'll clean everything up and make sure to keep checking on it as part of my pre-ride inspection.
The switch is pretty tiny, just looks big all zoomed in. It's 41mm width, 18mm height, sticks out 8mm from the bars. (1.6" x 0.7" x 0.3" for you savages). There's an extra 4.75mm (0.19")...