That... Isn't trueand don't buy the generic or discount bleach. Most if not all of those do not have the concentration % that name brands do.
I spray it on full strength and heavy, let sit overnite. If mold is heavy I will use a brush to loosen it up, rinse and repeat. The acid of the vinegar kills the mold, also works great on bugs!will try the cleaning vinegar again, maybe I didn't let it sit long enough.
Certainly safer than bleach.