I Spent Memorial day weekend on Grand Lake of the Cherokees in OK. I know they have recently discovered zebra mussels in this lake. I washed down boat and trailer after leaving the lake. I noticed patches that appeared white and felt gritty on the hull. Could this be mussel larva. I had the boat in a slip for 4 days. Should the block and drive be drained or would flushing be sufficent. I would hate to be the one who infested our local lakes. Any help would be greatly appreciated<br />2005 Rinker R2