Has anyone any novel ways of cleaning the above - the flat filter on the GM 900 - I think from memory 9000's are the same? I have the cleaning fluid and oil and was thinking of using some form of shallow tray presumably running the cleaning fluid from the clean side through so the dirt comes away below and does not contaminate the 'inside' or is it better to hold filter vertically and 'baste'with a clean paintbrush.
Mike
Mike