What is best way to analyze 10% ethanol solution for residual solvents such as acetonitrile

I am using an agilent 6890 split splitless injector with a dbwax to analyze 10% ethanol solutions for trace residual solvents such as acetonitrile and dmso.  Due to the massive ethanol peak compared to the other peaks, I cannot "see" the minor peaks.  What is the best way to handle this situation? 

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