Dr Bronner's soap for it's various uses. Laundry, cleaning, body wash, hand soap, etc.
"Earn a badge" comes from a kids club called scouts where you earn a badge that you sow on your shirt for mastering a skill or doing certain things:
https://www.scouting.org/programs/boy-scouts/advancement-and...
So he's joking about earning a badge of being a hippy. Rubber tramp means live in a van (presumably a VW camper van).
Hmmmmmmmmmmmmmmmmmmm, I think I used it like normal shampoo. To be fair, my hair would be decently oily by that point.
It's a great handwash and all-purpose cleaner. It's good as a bodywash, but too drying. I'm trying to find some good probiotic soap as a replacement.
For Dr Bronner's to work effectively and cheaply, I think it's key to dilute and to use a foaming pump.