Some slime-makers have come up with substitutes for the harmful cleaner, uploading YouTube tutorials of safe ways to make the toy.

Making classic Nickelodeon slime is super easy. Mix together the oatmeal, applesauce and vanilla pudding in a large bowl, stirring slowly and thoroughly as you go. Add the green food coloring at ...

To make the slime, you'll need shampoo of any type -- though the thicker, the better -- and cornstarch. Here's how to make it: Put 1/2 cup shampoo and 1/4 cup of cornstarch in a bowl. Mix well.

This Halloween, learn how to make your own Ghostbusters-style ectoplasmic slime with this DIY video tutorial from the Official Ghostbusters YouTube channel.

Polka dot slime: Fold 10 to 15 soft pom-poms into clear slime (no coloring, no glitter) Hidden figures: Fold small figures or cars into the slime and ask your children to find them.

Garcia also runs a slime product line called Craft City. She took "GMA" behind the scenes in her Southern California home to give a step-by-step tutorial on how to make the stuff.

People have even set up shops and started selling the stuff – the slime world is a booming industry, apparently. If you want to get in on the trend, here are 12 of the best tutorials out there.