Put three gallons of hot water (11 litres or so) into the five-gallon bucket. Then mix in the hot soapy water from Step One, stir it for a while, then add a cup of the washing soda. Keep stirring it for another minute or two, then add a half cup of borax if you are using borax. Stir for another couple of minutes, then let the stuff sit overnight to cool. And you’re done. When you wake up in the morning, you’ll have a bucket of gelatinous slime that’s a paler shade of the soap that you used (in our case, it’s a very pale greenish blue). One measuring cup full of this slime will be roughly what you need to do a load of laundry – and the ingredients are basically the same as laundry detergent. Thus, out of three gallons, you’ll get about 48 loads of laundry.