If you are allergic to bleach can you use bleach alternative?

Bleach alternatives and natural alternatives are good if you are allergic to bleach. You need to stay away from chlorine which is the main allergen.

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It's NOT an allergen. Nor is its main ingredient chlorine: it is a compound of chlorine. It is however an IRRITANT, (and toxic if you drink it) because it is corrosive, and if it mixes with an acid it will liberate the corrosive gas, chlorine. (I know, indeed need to know, because I use powerful versions of bleach professionally.)