In the Doctor Who two parter, aliens of london/world war three The Doctor and Rose encounter the siltheen, an alien species that infiltrated 10 downing street to ruin the earth and sell it for rocket fuel. The siltheen can be destroyed by vinegar because they are a calcium based species.
spoiler
::: Um Actually The Siltheen is not the name of the species. It’s a family name. The actual species name is Raxacoricofallapatorians, other familes include the blathereen and Hamazeen
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