Crayons can be all sorts of different colours, not just orange and purple. Do you know what they're made of? Martin: Are they made of wax? Curious Cat: Yes, that's right. And wax is made from oil ...

Because crayon is a wax, it can leave a nasty stain on anything that it comes into contact with. I have good news, though: It isn't the end of the world. There's a way to remove wax from just ...

That said, crayons are made from wax and petroleum oil, and they require the right cleaning products and techniques to remove ...