What is a periodic clean?
A periodic clean is work carried out at a longer interval than the daily routine — carpet cleaning, floor restoration, high-level dusting, window cleaning — and scheduled separately from it.
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<img src="https://cleanoptix.co.uk/glossary/periodic-clean/diagram.svg" alt="periodic clean — diagram from CleanOptix" width="880" height="620" loading="lazy">
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<a href="https://cleanoptix.co.uk/glossary/periodic-clean">What is a periodic clean?</a> — diagram by
<a href="https://cleanoptix.co.uk">CleanOptix</a>
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</figure>Periodics are what keep a building from slowly declining while every daily task is completed correctly. Daily work maintains a standard; periodic work restores one, and a contract without it degrades no matter how well the daily round is run.
They are the most common source of contract disputes because they are the easiest to defer. Deferring a quarterly floor clean saves money this quarter and is invisible until the floor looks wrong, by which time restoring it costs more than the cleans saved.
Because they are infrequent, they need scheduling and evidencing in a way the daily round does not. Nobody forgets whether an office was cleaned last night; everybody forgets when the carpets were last done.
In practice
A schedule with a monthly task listed in a box at the bottom.
High-level dusting sits there, undated, for eleven months. It is done once, in a panic, the week before the client's annual audit.
A periodic task that is not placed on an actual date is a task that happens in the last week of the month if it happens at all, and it is the commonest audit failure on an otherwise well-run site.
Putting it on a Tuesday makes it real. Leaving it as a frequency makes it an intention.
What goes wrong in practice
- Scheduled in a spreadsheet nobody opens, so they are done when someone remembers.
- Completed without evidence, leaving nothing to show a client who asks.
- Deferred repeatedly to protect a margin, with the deferral never surfacing at review.
- Priced into the contract but delivered ad hoc, so the client pays for a frequency they do not receive.