So i just bought a brush, after my first one fell apart on me. (it was a 10 dollar job really cheap) anyway, I noticed this time it says not to put in boiling water? Anyway, usually what I do is I have a 4 qt pan, that I boil water in, then walk it over to the bathroom drop my mug and brush in, while I take a shower. That heats up the mug nice and warm then I make a lather and shave. Anyway, it wasn't super expensive but the brush ran me about 50 bucks, so I'd prefer it last a little longer than the last one. So I'm wondering how hot is too hot when it comes to soaking brushes?