They cleaned up all their tracks

On the detective show “Will Trent”, episode 6, Will said about criminals he was having trouble finding: “They cleaned up all their tracks.” Certainly makes sense, but it is a mashup of “cover (one’s) tracks” (hide or destroy evidence of one’s past activities) and “clean up (one’s) mess” (make things neat again). A big thanks to Barry Eigen who heard this one and sent it in.