Face/body: Generic bar soap. Any brand, I'm not fussy.
Hair: No cosmetic products, they caused scalp problems. Now it's a plain water rinse, or water and tea tree oil, or chamomile tea. If hair gets really dirty, I use a raw egg as shampoo. Natural sebum levels, and no more scalp problems.
Do you have to change your pillowcase more? Curious.
Weekly change is fine. Going to bed with wet hair isn't a good idea though. The first couple of months were different, and pillowcases were changed a lot more often till the sebum levels settled down.