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It usually leaves a very minimal crust of rusty powder. I've just kept adding to it. After 5 years I maybe have 1/2 a litre of residue.

And yes. Collecting all the coolant is almost impossible for...

I do, to an extent. I have built a solar evaporator out of old solar water heaters, to process any used coolant from my vehicles (who's a good boy?)

I was thinking more of contamination around the...

I did read that the waterless stuff is able to work with a certain % of water as its very hard to remove all of the water in the system, even with a flush. I also wonder how good this stuff is for...