How do I get slime out of hair and clothing?

Adding way too much slime activator like borax solution or contact lens solution or whatever you used for the slime can harden the slime so it clumps together and falls off. You can also add slime softener like lemon juice or glycerin so the slime kind of dissolves and you can rinse it off. You might still need to wash it a bit though. I find that a lot of hand sanitizers work if you rub it into the slime and then scrape it off with a hard flat tool (like a plastic card) works really well.

if you are working with hardened slime, try rubbing an ice cube on it to loosen it up, just like you would with bubble gum in your hair. then add the vinegar. rub the vinegar in with a toothbrush or some other similar brush.

Did you make the slime with contact solution? If so, soak his hair in contact solution and it will loosen it up enough that you should be able to slide it right out of his hair, no cutting required. :)

Olive oil worked wonders for me. My kids tend to get slime in their hair pretty often, so I have some experience here. Just pour a dollop of olive or vegetable oil over the clump of slime and then work it in with your hands. The slime will come right out. Give them a bath and shampoo their hair when you're done.

I got slime on my sweatshirt, but was thankfully able to use vinegar and laundry soap to get it out, so it's worth trying that before spending money at the laundromat, especially because the longer the slime sits, the faster it'll harden.

Use conditioner. The conditioner should soften up the slime enough to get it out of his hair, although it may take a few washes with shampoo to get all of the residue out.