I have PEG contamination in my LC. I tried flushing with hot water and that did not work. I also tried a mixture of 10% conc. ammonium hydroxide, 80% IPA, and 10% Water. This also did not work. Any other suggestions for other flushes?

I see Na adducts of PEG on all 4 channels. I have been rinsing for days and have not seen the intensity decrease much. 

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