Kids LOVE slime! It can be messy, but I have done it enough times to know how to do it in a manageable way. To start, (1) I have a rule that the slime can only be played with on their plastic tray, each child has one. Otherwise, I will find slime all over the house! Next, (2) I learned the hard way that children should not make slime until they are two years old. I tried with my daughter, at about one year old, and in an instant she put it in her hair and I had to cut off some of her curls to get it out. So learn from me, wait until they are at least two years old. The last rule stems from the second, (3) no slime in the hair or in the mouth. My children had to be able to agree to this before we could make it a regular project.
That being said, it is a super fun sensory experience, as long as they are old enough to follow those rules. There have been times my son will play with his slime at the table for an hour!
You will need a small bowl, spoon and I recommend this plastic tray. Let your child empty one bottle of glue into the bowl. Then add the 1/2 tsp Baking Soda and mix thoroughly. Once it is mixed, then add 1 1/2 tbsp Contact Lens Solution, and again mix thoroughly.
If the slime is still too sticky, knead into the mixture with your knuckles, and add more Contact Lens Solution until it is more firm.
When cleaning up, I like to wipe the glue residue off the bowl / spoon / try with a wet paper towel, directly into the garbage. This is because you don’t want the left over glue solution to go down the drain of your sink.