anything from 0 to 99%-i'm not aware of any magic number-the only purpose of the vinegar is to cut through/dissolve any calcium/mineral stains/deposits-if you don't have that, regular water will do. when working at lfs's i just used plain water, MAYBE a cup of vinegar to a 5 gal bucket, and a squeegee.-works just as well as ammonia
edit: back in the 70's when working at my 1st lfs we'd just use newspaper and abit of elbow grease, heh.
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