im confused about something.

when people talk about cleaning their system and letting it soak etc. what do they mean.
leaving the unit in a bucket of soap or what? also whats this purpose? is it to removed adhesive? i thought thats what my c22 and pure were for? also i heard you need to exfoliate and cleanse ur scalp before wearing? is my shampoo not good enough for all of this? if not, then can someone tell me which cleanser or exfoliater il have to buy.. and which over night washing soap id have to buy if i have to let my unit soak or whatever its called.

i was under the impression that shampooing would be enough to remove adhesives form my head and cleaning it enough to reattatch and also thought spraying c22 and pure and then doing the mirror slide was enough to take care of the unit