I've browsed far and wide for home remedies for an indoor ant problem. Whenever vinegar or rubbing alcohol are mentioned, the instructions always say to cut them with water and sometimes dish soap. Can anyone explain the purpose of that? Why not spray the straight 100% vinegar/alcohol?
P.S. Context: This is a rented 1-bedroom apartment on the 9th floor of a highrise, so many outdoor ideas are not applicable. I suspect that many ideas about modifying the unit or blocking outdoor entry don't apply.
P.P.S. More web searching reveals that vinegar repels ants, but doesn't hurt them. I find this odd, as straight uncut vinegar is acidic. I'm wondering about the veracity of the claim that vinegar is not harmful to ants. Would someone with expert knowledge be able to sine some light on this?
P.P.P.S. Disturbing observation today: Undiluted vinegar doesn't even seem to repel my ants. I sprayed some droplets on the counter top so that I can prepare food with some peace of mind. Lo and behold, ants were traipsing about the droplets. Isn't evolution a marvel?