Concise answer
The operating clinic should give a specific washing schedule because technique and aftercare protocols vary. Early washing is usually gentle and designed to clean without rubbing or dislodging healing graft sites.
Water pressure, product choice and fingertip friction matter more than simply deciding whether the scalp can get wet.
Scabs should not be aggressively picked; their care should follow the surgeon's written instructions.
When evaluation may help
Ask the clinic before changing the protocol and contact them if washing causes bleeding, increasing pain, discharge or unexpected graft-site changes.