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Using too little soap while washing clothes fails to clean them properly because:

1. soap particles remain floating in water as ions
2. the hydrophobic part of soap is not able to take away grease
3. the micelles are not formed due to concentration of soap, below its CMC value
4. colloidal structure of soap in water is completely disturbed.

Correct answer: the micelles are not formed due to concentration of soap, below its CMC value

Solution

Soap removes grease only by forming micelles that enclose the oily dirt. If too little soap is used, the concentration stays below the CMC, so micelles do not form and grease is not removed.

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