This has long been a problem of mine. I looked in many toy stores to find a kid’s washable marker solution. I did not think of dive plates! From Cameron:
I written before about showering as an ideal model for creative pause—minimal distraction, mental freedom, and a change of scenery. … For the past few months, I’ve kept a dive slate in my shower. These are typically used by instructors during scuba training or to capture notes on a dive.