It's also worth checking your shoe/pedal interface. I've had shoe material squeak/rub on the pedal, cured by cutting away bits of the sole. Try spraying Pam or lube around the cleat area and see if it goes away. That may indicate the above condition.
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"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.