The Soccer Shoe Clue

Kick! Splat! Yuck!
Who let the air out of the soccer ball? WHo added salt to the water on the sidelines? Who put the red glop in the goalie's soccer shoes?
It's gooey. It's gross. It's not fair. Soccer is supposed to be a kick. But somebody's being a drag. Nancy Drew wants to know who's playing the silly games with her third grade soccer team!