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comment by kleinbl00

    Artificial contamination of Gruinard Island off the northwest coast of Scotland occurred in 1942–1943 as a result of tests of a biological warfare bomb containing live anthrax spores. Even by 1979 spores could still be detected in a 3-hectare area of the island. In the 1980s the area was decontaminated by burning the vegetation and spraying with 5% formaldehyde in seawater. By 1987, the ground was declared anthrax-free and, after reseeding, sheep were able to graze safely.

https://en.wikipedia.org/wiki/Gruinard_Island

Wanna get rid of anthrax? You literally need to blowtorch the top six inches of topsoil and then soak it with 280 metric tons of formaldehyde.