I tried out one of Mama Bears mentholated soaps the other day, and the brush seems to have picked up a lot of the menthol. I mean its not a huge bother, but I wanted to try out other soaps and creams and I can't get the menthol off the brush. I tried shampooing the brush with super hot water, but it still has the menthol feel to it when I use it.

And just to make sure I'm not a complete idiot, I was testing the Proraso White soap. As far as the description shows on the container, there should be no menthol on that soap. Is it just something I have to wait for it to wear out on its own, or is there some way I can speed up the process?