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See how the polarity of your sample is.
The usual cleaning 2ml LC vials method is: pour out the sample solution and soak it in the surfactant, that is, wash the spirit water, ultrasonic for more than 30min, so that it is washed 2-3 times repeatedly, then washed with tap water for 3 times, then cleaned and then used pure Wash water 1-2 times.
If the sample is not easily soluble in water and soluble in organic solvents, it can be washed with ethanol for 2-3 times and then washed with tap water. The general idea is to wash with a solvent that is soluble.
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