Answer

There is no universal Jain rule that says clothes may be washed only on certain days of the week.

• For Jains in general, clothes can be washed when needed, with care for ahimsa and water conservation.
• For Jain monks and nuns, there is also no fixed “washing day” rule across all traditions.
• In practice, this depends on the sect, monastic code, and the order’s discipline.

Explanation

For Jain householders, washing clothes is a practical activity. It is not usually forbidden on specific weekdays in mainstream Jain tradition.

However, many Jains try to observe these principles while washing:

• use minimum water
• avoid harming tiny living beings in water
• wash only when necessary
• keep the mind calm and non-violent

For Jain monks and nuns:

• Digambara monks do not wear clothes, so washing clothes does not apply to them.
• Śvetāmbara monks and nuns wear simple white cloth, and any cleaning or maintenance of robes is governed by strict monastic discipline.
• They generally do not do ordinary worldly work in a casual way; if washing is permitted, it is done only as part of their regulated conduct and with great restraint.

Spiritual Understanding

In Jain Dharma, the main concern is not the day itself, but the intention and the level of violence involved.

The spirit behind any such act should be:

• non-attachment
• carefulness
• minimum harm
• simplicity

So the focus is less on “which weekday” and more on how gently and responsibly the work is done.

Takeaway

• Householders: clothes may be washed any day if necessary.
• Monks and nuns: there is no single pan-Jain fixed day rule; it depends on the tradition and monastic discipline.
• Digambara monks: washing clothes is not applicable.

If you want, I can also explain this separately for Digambara and Śvetāmbara traditions in a simple chart.