When they need it . I don't do a lot of domestic but when I do i always clean the frames on domestic. Commercial when they need it otherwise you will be spending a lot more time on site, and a lot more water.
Same as Adrian - commercial we tend to miss the top frames where there are vents or holes and such like as your just asking for trouble - a monthly domestic. Dead easy to keep on top of once 1st cleans done .
I rent some work off another windy as do some other guys ... recently he moved us round and i was met with filthy frames and sills on every single customer most between £20 - £35 that the other guys had been doing i cant leave them like it so took me ages
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