To clean dirty clothes effectively without detergent, you can try the following methods:

Add Baking Soda: Incorporate a small scoop of baking soda to your wash to enhance cleaning power and neutralize odors.
Use White Vinegar: Add white vinegar during the rinse cycle to brighten colors and remove odors.

Natural Alternatives: Consider using natural cleaning agents like borax or washing soda, which can help break down tough stains and improve fabric softness.
Avoid Overloading: Ensure your washing machine is not overloaded to prevent damage to the fabric and to allow for effective cleaning.

Intense Wash Cycle: Use a more intense wash cycle, such as heavy-duty or deep clean, to maximize cleaning power.
These methods can help keep your clothes looking fresh and clean without the use of traditional detergents.