How To Make Soap: Natural Homemade Soap Recipe for Hand ...
Lye in Homemade Soap. The one thing in homemade soap you can’t substitute is lye. You should always use 100% sodium hydroxide, or lye in crystal form. Don’t substitute liquid lye or drain cleaners such as Drano. These may cause inaccurate measurements or have bits of metal in them. You don’t want either. Lye is caustic.