Wash your hair at home prior to the scalp cooling/chemotherapy session and avoid high-powered shower heads. Greasy hair may affect thermal contact. However, avoid daily shampooing (to avoid strain on the hair), shampooing 1-2 times/week is suggested, and shampooing less if your hair feels dry. Use lukewarm water (avoid hot water) and gentle shampoo that is sulfate and paraben free.
If you feel the need to wet your hair between washings, you can use a spray bottle to get your hair damp. You will need to comb through your hair prior to getting it damp, to avoid tangles.