On this question from 2012, most of the answers are essentially the same: suggesting minor variations on a similar solution. None provide sources other than personal experience.
Today another two answers were posted in addition to the four from 2012. One, which contained profanity, was clearly spam. The other seemed to be in much the same vein as the earlier four answers: a variation on a similar solution, in this case a certain brand with a certain formulation.
Why did that answer (and none of the original four) get downvoted and voted to delete?
Sure, it's not a brilliantly crafted answer by any means, but I was under the impression that SE encouraged suggesting improvements rather than deleting potentially useful information.