Clean, Drain & Dry Your Boat Start Date: Immediately End Date: NONE Clean, Drain and Dry Your Boat Clean, drain and dry your boat to prevent the spread of zebra mussels in Texas lakes. Nonnative zebra mussels can wipe out native species, and clog municipal drains and pipes, costing millions of dollars in repairs and untold damage to the environment. Ten Texas lakes are fully infested, and another five are positive for zebra mussels. Clean, drain and dry your boat whenever you move it from one water body to another. Find information about preventing the spread of zebra mussels in Texas on the Texas Parks and Wildlife website.