Pour a cup of bleach in the live well and let it mix and and sit for a day. Flush it out good.
From TPWD site:
Power-washing with water at least 140 degrees Fahrenheit and flushing the motor, bilges, live-wells and other water intake systems with 140-degree water will kill zebra mussels. To be effective the water coming out of the flushed systems needs to reach 140 degrees to ensure the entire system was exposed to water hot enough to kill the mussels.
If it is not possible to clean the internal systems or compartments using 140-degree water, the use of either straight vinegar or a chlorine bleach and water solution (one-half ounce bleach to one gallon water) can be effective at killing zebra mussels as long as the mixture is kept in contact with the mussels for 20 to 30 minutes. Clean water should be used to flush the chemicals and dead mussels from the boat following treatment. Boat owners should check with their manufacturer to be sure using these chemicals will not void their warranty.
Edited by Muzzlebrake (06/06/17 08:51 AM)
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!