The home of former spy Sergei Skripal is to be declared officially decontaminated of Novichok today, after 13,000 hours of cleaning.
The nerve agent was found on the door handle of the property on Christie Miller Road in Salisbury, and left resident Mr Skripal and his daughter Yulia critically ill in hospital.
Following the clean-up, the property will be handed from the Department for Environment, Food and Rural Affairs back to Wiltshire Council.
Eleven other sites across Salisbury will also be ruled safe after being identified as potentially infected with traces of the nerve agent.
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Along with the house, they include the park bench where the Skripals were found collapsed, the Zizzi restaurant where they had dined beforehand, and the home of Detective Sergeant Nick Bailey, who was exposed to the agent.
Military teams took 5,000 test samples from across Salisbury and nearby Amesbury, where 44-year-old Dawn Sturgess was found fatally poisoned, during the 355-day clean-up, named Operation Morlop.
An estimated 600 to 800 specially trained military personnel, including the chemical, biological, radiological and nuclear regiment, were involved, with 190 working at any one time to cross into and decontaminate danger areas.
A senior military source said the Skripal house was the "most complex" but each decontamination effort was "bespoke" to the site.