How to Choose Between Laundry Detergent Liquid, Powder, or Sheets
by Elizabeth Yuko from Lifehacker on (#6ATZB)
Some of the first mass-produced laundry detergents were bars of soap that were used with a washboard and washtub. Powders and liquids became the detergents of choice for modern washing machines, which became increasingly popular in the 1950s.