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I've read that using Pam spray (or vegitable oil) will keep the ice off. I haven't tried it either though.
Every time mine freezes up I put in in my mouth
Im a guitar player and use the ends i cutt off my stirngs. Works better then any spring bobber i have tried.
I agree with the guitar dudes but if you want a surefire way throw away your reels and go back to hand over hand. You not only will have no ice up, but will catch more fish than trying to reel. Don't laugh- try it. You'll see