Hades method improved.
Obtain a pint or so of Propylene Glycol from a respected dealer.
Heat up 1 application to where it is tolerable for a hot glycol treatment to your scalp and hair.
With a dry head & body.
Apply the Propylene Glycol massaging into scalp, hair and other areas that are test worthy.
Distribute evenly and comb through hair
Leave on 6 minutes
Rinse well with luke warm water
Let dry and repeat till your anxiety goes away :-) I would think 5-10 wet to dry applications would remove enough from anyones hair. Just a guess though.
Can also do while wet but I would guess you are increasing the absorbtion by applying it to dry hair. I believe it's increasing absorbtion through osmosis rather than just diffusion :-)