Dr Mark Enright, an expert in molecular epidemiology at Imperial College, London said deep cleaning would be a waste of resources and an inconvenience to patients and staff.

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"We can't say for sure how much of that benefit is down to the yoghurt and how much they are down to a whole range of infection control procedures that the hospital has in place such as the deep cleaning programme, the bare-below-the-elbow programme, and the increased isolation procedures, " Ms Heyes said.

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This followed a deep-cleaning process known as "fogging", which uses hydrogen peroxide vapour.

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FieldTurf also makes machines for annual deep-cleaning.

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The morning after the eviction, teams of cleaning crews with power washers moved in to execute a "deep clean" of the site, which gained a reputation for a foul smell during its four months of operation.

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It measures force to determine 3-dimensional position, such as deep, shallow, horizontal or vertical, and adapts the pool cleaner for maximum cleaning action.

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But opponents of the deep cleans have been joined by representatives of the companies who, alongside in-house cleaning teams, are responsible for carrying them out, and of the managers responsible for overseeing them.

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