In Jain practice, it is generally avoided to use utensils for Jain cooking if they have been used for non-Jain food, even if washed.

Why?

• Jain food is meant to be prepared with pure intention and careful observance of ahimsa.
• If the utensil was used for non-Jain cooking, there may still be residual contamination from ingredients like onion, garlic, root vegetables, eggs, meat, or alcohol.
• For many Jains, especially in stricter observance, washing alone is not considered sufficient.

Common practice:

• If the utensil was used for completely vegetarian, Jain-acceptable food and washed very thoroughly, some households may accept it.
• But if it was used for non-Jain food or food with any prohibited items, it is usually not preferred for Jain cooking.

Best approach:

• Keep separate utensils for Jain food.
• If that is not possible, use utensils only after very careful purification, according to the family’s tradition and level of observance.

So, from a strict Jain viewpoint, it is better not to use them.