The ratio depends on what company's chemicals you are using. If it is a general use chemical it then depends on what you are cleaning and what surface you are cleaning on. All those products have different formulas. Then it also depends on how much you pay for your chemicals too.
$10 a gallon of 20:1 concentrate is the same as
$5 a gallon of 10:1 concentrate
As a general rule:
$10-$12 a gallon for a 20:1 cleaner/degreaser is average
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