hi,
I'm experiencing persistent peg contamination since when I analyzed a peg-containing sample. I'm pretty sure to have washed out the contamination from HPLC -ms system, but once I set up the chromatographic column, the PEG reappears. so I'm confident that the polymer is stuck in the column. is there any particular wash that I could perform to get rid of this contamination?
thank you for any advice,
Antonio