Which of the following is NOT a method to avoid marine hitch-hikers?

To address the question about avoiding marine hitch-hikers, it's important to recognize that the correct choice highlights an option that is not effective in preventing the transfer of aquatic invasive species or unwanted organisms.

Using power to wash the boat may provide a surface clean, but it does not guarantee the thoroughness required to remove all marine hitch-hikers, particularly those that are well-adhered to the surface or hidden in crevices. Additionally, the use of power washing can sometimes inadvertently spread these hitch-hikers further rather than effectively removing them. In contrast, the other methods listed—removing drain plugs, flushing cooling systems of outboards, and washing down the trailer, boat, and gear—target specific areas where aquatic organisms could reside and effectively help in their removal, thereby reducing the risk of their introduction into new environments. These methods are designed to be proactive measures that help ensure that the vessels do not transport non-native species from one body of water to another.

In summary, the method described does not align with the proactive measures necessary to effectively manage and avoid marine hitch-hikers, making it the least suitable option among the choices provided.