i let mine soak in 91 percent isopropyl alcohol until it comes out as a stream and then run them under hot water. sometimes i'll let them soak in some Listerine after doing the alcohol bath prior to washing them out blow out the excess water and let them dry overnight. it's worked for me so far and i haven't lost one yet. i've had ones that give a horrible burnt flavor and after doing that several times they work great again.
i haven't heard of anyone using denatured alcohol so i'm not sure how it would work. isopropyl is cheap enough you might as well
buy some. denatured alcohol does work great for getting tree sap off car paint though.
if you hear a gurgling sound, your atty is flooded. just blow it out on a paper towel and put the cart back in. blow into the cart side and have the battery side towards the towel. if it's flooded you should get a bunch of liquid coming out.