I use it straight out of the bottle, the ~5% or so concentration you get at the grocery store. Just to be clear, NOT “cleaning vinegar” which would probably eat through your colander. The only time I’ve tasted a difference after using the vinegar was when I didn’t rinse it well enough and got that tart pickle taste on a grape or two (wasn’t that bad actually). Since it’s food grade, even if you miss a bit it’s NBD, which is not the same case for some other produce washes. Definitely give it a try, even my husband who hates vinegar hasn’t complained.