The Piccadilly line takes the crown as the dirtiest tube service, averaging 43 days between full-service cleans, far less frequent than other lines.
TfL's cleaning regimen divides maintenance into 'mini cleans' and 'deep cleans,' targeting different levels of cleanliness across the tube network.
While the Jubilee line performs slightly better than the Piccadilly in cleaning frequency, it's interesting to note both have similar fleet sizes and bacterial levels.
The results of the FOI request have brought light to the disparities in cleanliness among London’s Underground lines, sparking conversations among commuters.
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