Maybe a few drops of the essential oil you like?
I rinse my hair with ACV, and sometimes I put a few drops of mint or lavender in it to ease the vinegar smell out.
My husband has two things he truly hates the smell of........one is pine-sol, the other is vinegar. Pine-sol isn't a problem, don't like it or use it, but I use vinegar like crazy so I have need to disguise the scent often, LOL