A method of attaching electrodes to a patient, the method comprises the steps of providing a squeezable member having a hollow interior, wherein a skin abrasive solution is in the interior, wherein the squeezable member includes a restrictive member having a restrictive opening for restricting flow of the skin abrasive solution out of the squeezable member, and a tip through which the solution leaving the restrictive member exists the squeezable member； squeezing the squeezable member； scrubbing skin portions of the scalp of the patient with the tip； and attaching electrodes to the skin portions of the patient's scalp.
