re: Stinky screwdriver and cure for the mange

I got the gallon of 30% from a friend in the chemical supply business, filled  my jug from a 1000 gallon tank.  You can find it online for about $40 per gallon.  I also got some 40% from a beauty supply store.  She would not sell me the 50% I wanted because I didn't have a beautician's license - a chemistry degree would not work, but a hairdresser can get all she wants !