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Generally look at the polarity of your sample.
In general, the 2ml HPLC Vials of the 2ml HPLC Vials, the sample pad and the lid are washed separately. Ultrasonic for 30min or more in the surfactant (that is, washing water). Sometimes the cover and the mat are sonicated when they are lazy.
Ultrasonic three times, then washed three times with tap water, cleaned twice with pure water. Basically it's clean. Be sure to fill the bottle with liquid when you are ultrasound. Because the mouth is small, there may be bubbles blocking the mouth of the 2ml HPLC Vials.
Sometimes the sample is insoluble in water, so consider cleaning with ethanol. Specific analysis of the specific situation.
This is the end of the introduction of How to properly clean the 2ml HPLC Vials?. I hope it can help you.