Eau Claire police say they are working on several leads after vandals hit five schools late Sunday night and early Monday morning.

Investigators are going over security camera footage from several of the schools. Eau Claire police say they have a good idea who may be involved, but they haven't been able to track everyone down yet. Until they do, they're holding onto that video. In the mean time, the school districts are working hard to clean up the mess.

While the police do their leg work, the school districts are busy erasing the vandals’ dirty work, with high pressure hoses, a lot of elbow grease, and lots more of a common baking ingredient.

“It's basically nothing more than baking soda, but it's real fine and shot at a high volume. Soda basically is a real delicate process that removes paint,” says Elmer Thorpe, who did the clean up at North and Memorial high schools.

Police say the vandals hit Hudson, Menomonie, and New Richmond’s high schools and Eau Claire North and Memorial. The vandals spray painted the schools, signs, rocks, posts, and sidewalks with phrases like "River Falls" and "RF dominates." They also threw salsa on the walls of the Menomonie High School and painted on every bleacher at the New Richmond football stadium.

“We've solved a lot of our cases by offering rewards and things like that at the schools where we've had problems,” says Buildings and Grounds Director Charlie Kramer, with the Eau Claire School District.

River Falls High School Principal Elaine Baumann says she is working with investigators to try to pick out any river falls students on the surveillance video, but hasn't come up with any matches yet.

The clean up is expensive- $110 an hour. That's a problem for many of these school district's which are already short on cash.

“We've got considerable man hours for our custodial staff and maintenance staff in the emergency cleaning that we did. We just try to get the stuff done and pay for it afterwards,” Kramer says.

Investigators at the Eau Claire Police Department say the people involved may have to pay dearly- they would be responsible for the clean up costs and could face felony charges. School leaders say the bottom line will easily be thousands of dollars at each school.