In Jain Dharma there is no scriptural rule that says you must wash your hair on the 2nd day or the 3rd day of menstruation. Menstruation is a natural process. Cleanliness (shauch) is encouraged every day, so you may wash your hair whenever needed.

Simple Jain maryada to keep in mind:

• Prefer bathing and hair-wash in daylight hours.
• Use only the needed amount of water; avoid very hot water to minimize himsa.
• Comb gently and avoid unnecessary hair-pulling; dispose of fallen hair carefully.
• During periods, many families keep traditional limits for temple/pooja; follow your own sangh/family maryada.

Digambar and Shwetambar: There is no sect-specific rule about which day to wash hair; practices vary by local tradition only.

For related Jain guidance on periods and maryada: