When you see the green, ugly face of Mr. Yuk, you know there’s something you shouldn’t be touching.

That’s the message that was being delivered to the first graders at Saint Luke School in Erie.

Mike Bailey, a master gardener,  brought his team to the school to help the students learn about good and bad bottles, cans and containers that are found in most homes.

Bailey will help the students learn the difference between good and bad household items.

The students were each given a sheet of Mr. Yuk stickers so they, and their parents, can place them on harmful household products.