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I pour a couple of mugs worth of boiling water in it while it's still hot and runny. The wax stays on top of the water, the grime settles to the bottom of the wax but above the water. Slide a knife round the edge, the puck comes right out, then you shave the grime off the bottom. Surprising how well it works, but yes you'll lose a small amount of wax and any additives. How much is relative to how big your puck is.
TooTallTim-
pour a couple of mugs worth of boiling water in it while it's still hot
Exercise caution here, if the wax is over 100°C the water can flash boil and spray the house with scalding molten wax. Of course, it shouldn't be and it won't be if you're using a bain-marie, but it's easy to overheat the wax if you're using direct heat.
gbj_tester
I've been thinking recently about cleaning the wax I've been using. How easy is it to get the puck out of the pot? I tried halfheartedly one time when it was dry and it wasn't budging. I read a suggestion online about pouring in some water when it's melted. The theory is that the grime settles down in the water and the puck of wax cools on top. Haven't tried yet though. Also, I added a powder of additives to my wax when I started. Is there any risk that I'll be scraping that away too? Maybe I'm over thinking it...