Enter the porcelain palette. I bought this one three months ago, and the top picture on the right is what it looks like after a couple of days of terrain painting. The middle shows it soaking in hot tap water. After 45 minutes i took it out and gave it a rough scrub with a scouring pad – sparkling!
The trick is that the firing process leaves a coat of glass on the porcelain. This surface is smooth, so the paint has nothing to adhere to. It may seem like a trivial point, but having an easy-to-clean palette like this does wonders for my painting. The pristine white surface shows the colours much better.
If you’re going out to buy one, I have one tip for you. Get one with circular wells in (like this – I couldn’t find one). Since we wargamers use so small amounts of paint, it’ll leave less surface area for the paint to evaporate from.