Answer

In Jain Dharma, water is understood to contain living beings, so using it carelessly can cause harm. For a Jain muni, the principle is to use the minimum necessary water, only for a genuine need, and always according to the discipline of the guru, gacch, and āgama-based tradition you follow.

Explanation

If you are asking about cleaning the body after passing stool:

• Yes, water use can involve himsā in Jain understanding, because water-bodied जीव are present in water.
• But necessity matters. Jain monk discipline is not about ignoring cleanliness; it is about avoiding unnecessary violence.
• So the usual principle is:

- use as little water as possible - use it carefully and mindfully - avoid waste - follow the exact rule of your ācārya and tradition

In some Jain traditions, a muni may use water for bodily cleanliness when required, but always with great restraint.

Spiritual Understanding

The heart of Jain practice is ahimsa. That means even when something is needed for bodily maintenance, it should be done with the least possible harm.

So the question is not simply, “Can I use water?” It is, “Can I use it with the smallest possible violence and highest possible discipline?”

That is the Jain way.

Takeaway

For a Jain muni, cleansing with water may be allowed only as a necessity and with strict restraint, but because water contains life, it should be used as little and as carefully as possible. The exact practice should be followed according to your āchārya and sect tradition.