Environment Agency
Environment Agency guidance explains that contaminated wash water must be managed so it does not enter surface-water drainage.
Read the source →South West, England
The main question for a roof cleaning job in Exeter is what is actually included. Photograph roof covering, pitch, visible growth, fragility and safe access and make clear whether the request covers removal, treatment, gutter clearance or repair work, with each part itemised.

The Exeter brief
Focus on roof covering, pitch, visible growth, fragility and safe access. The key comparison is whether the request covers removal, treatment, gutter clearance or repair work, with each part itemised.
Evidence before method
These sources support the planning questions on this page. They do not prove that a particular method suits an unseen property.
Environment Agency guidance explains that contaminated wash water must be managed so it does not enter surface-water drainage.
Read the source →HSE guidance says work at height should be planned and suitable equipment selected for the task.
Read the source →Questions for Exeter
It should identify the proposed method, access approach, protection, waste handling and any treatment. Repairs or guarantees should never be assumed from the cleaning price.
Washom does not publish an unsupported Exeter average. Give each provider the same photographs, measurements, condition and access notes, then compare what each total includes.
No. Submit the roof cleaning brief and Washom will check for suitable independent-provider options. Availability depends on the job and location.
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Your next step
Share photographs, surface condition and access once. Washom will check suitable independent-provider options for this job.