Acetic acid was the main component of vinegar. As an acid, it had a sour taste and smell. It was lethal to the calcium-based Raxacoricofallapatorians, (TV: World War Three [+]Russell T Davies, Doctor Who series 1 (BBC One, 2005).) and according to the Thirteenth Doctor its scent could be used to repel spiders. (TV: Arachnids in the UK [+]Chris Chibnall, Doctor Who series 11 (BBC One, 2018).)