Nice thread, CuriouslyIncognito. Makes my day to see someone interested in herbs. If you really want to get excited, google Soapwort. Latin name is Saponaria officionalis. Saponaria is from Latin, "soap."

Also google Scouring Rush, or Horsetail. Latin name Equisetum hyemale. From the word "horse".

I could babble on forever about herbs, but it would take away the joy of discovery. Google them. You'll be set forever in cleaning supplies.