interesting. I would have thought the "shock" would damage the coil/s.
Eh, ... understand your point from metallurgical point of view. this is kind of a grey/gray/gr eh area though, need to consider that the temp is still low enough as to not start the metal becoming unstable, ergo it won't "mind" the quick 'tempering' from the water. that and i think most of the wire we use gets annealed which sets it to "blued" out already as a bit of a "tool" material.
So, just one of these bits where it kind of might have effect, or might not. kind of difficult to split the hair where it walks down. even narrow paths become wider than six lane roads if you know where you're going by memory or have a bit of help along the way. i think it's a combination of both at 'play' here.
how do you clean the inside of the coil ?
i shall answer you with the best i can ... *chuckles and continues laughing heartily*
*looks back at/through you* i think i'll charge admission for the show your smart ass can put on. *grins and chuckles all the more, laughing* i know there is a way, can think of maybe a few different ways but i need my damned coffee.
besides if you've got a sonic cleaner you already know, no point telling you.