Can't Clear when Preparing For Reuse

I'm experiencing a bug where I have a couple timers in UITableViewCells and when scrolling sometimes the timers are set to the of another cell.

Ex:
cell one: timer is at 30%
^
|
|
v
cell two timer is supposed to be at 100% but displays at 30%

I've tried to put 
`self.timer.animateOuterValue(0)`
in prepare for reuse but it didn't help

Thanks,
Kevin