There isn't a single "best" time for a regular bath (washing for cleanliness) in Islam. However, ghusl (ritual purification bath) is required or recommended at specific times. Here's a breakdown:
Ghusl becomes obligatory or highly recommended in these situations:
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After Sexual Intercourse: Ghusl is required after sexual intercourse to regain ritual purity and be eligible for prayer.
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Before Friday Prayer (Jumu'ah): Performing ghusl before the Friday prayer is highly recommended (mustahabb) for enhanced spiritual preparation.
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Before Prayers for Islamic Holidays (Eid): Ghusl is also highly recommended before the prayers for Eid al-Fitr and Eid al-Adha.
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Before Entering Ihram for Hajj: Ghusl is a recommended preparation before entering the state of Ihram for Hajj or Umrah.
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After Losing Consciousness: Ghusl is required after regaining consciousness if it was lost due to reasons that would invalidate ablution (wudu).
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Upon Formal Conversion to Islam: A new Muslim should perform ghusl as part of the conversion process.
Summary: While there isn't a specific "best time" for a regular bath in Islam, ghusl is essential at specific times to fulfill religious obligations and maintain ritual purity.