Borax is a White powdered ingredient also known as Sodium Borate. The most popular use of Borax is for homemade detergents.
It can also be used as an all purpose cleaner, simply add 2 tablespoons of Borax and 2 cups of hot water, mix well in a spray bottle and voila you’ve got your own homemade cleaning spray.
Borax is also a main ingredient in the recent SLIME craze, there are plenty of easy recipes all over the internet, some as simple as adding hot water and PVA glue.