"Backwash" is the seventh episode of the second season of the HBO original series The Wire. The episode was written by Rafael Alvarez from a story by David Simon & Rafael Alvarez and was directed by Thomas J. Wright. It originally aired on July 13, 2003.

Bunk and Beadie meet with Landsman to discuss using a computer to monitor dock traffic. He is initially outraged, but is more accepting when he learns that Daniels has granted them space in his detail's off-site location. Before storming out, he speculates that Daniels might take the Jane Doe case, which would relieve Homicide of the uncleared murders. Rawls later tries to persuade Daniels to take the Jane Does, but Daniels stands firm. Later, in an argument with Marla, Daniels defends his decision to stay in the BPD and tells her he is "playing their game" from now on.

Greggs and Prez follow up on the information from Shardene's friend, and find a strip club employing Eastern European dancers. They watch as the girls leave the club and file into a van, which they follow to an apartment building. Meanwhile, Herc and Carver purchase a expensive surveillance bug to get information on the portside drug trade, allowing the clerk to hold Carver's credit card as collateral. They place the bug in a tennis ball and have some success monitoring Frog. However, when Nick arrives, Frog distractedly tosses the ball into the busy street, where it is demolished by a Mack truck. Herc and Carver later plan to fraudulently claim to work with an informant to recoup the cost of the bug.

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