The white vinegar recipes usually have you add some lemon juice or something similar to raise the acidity. Cider vinegar is already acidic. The cider vinegar works so well that I see no advantage to concocting a mixture.
There are quite a few "old fashioned" tricks that don't get discussed on boards these days. New products came along that made them a bit redundant or inconvenient. I am a miser, so if it's cheap and works, sign me up.
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