Which ingredient(s) would be the LEAST important in determining how well the cleaner can clean windows?

A cleaning agent contains ingredients listed in the figure below. Exhibit:

Which ingredient(s) would be the LEAST important in determining how well the cleaner can clean windows?
A . ammonium hydroxide solution
B . borax
C . ammonium hydroxide and color
D . borax and perfume
E . perfume and color

Answer: E

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