Okay - thanks for the link to the video. I watched and am still curious. Is there no way to access the filter within the reservoir and change or clean it, or do you have to buy a new reservoir?
Process is simply diluting the old fluid until you get mostly new, from what I can see. I've read that some members regularly use a turkey baster (to suck fluid out) and simply top up with fresh fluid, as a maintenance regime. I will admit that one of the hoses on my reservoir appears to be leaking slightly, so I should inspect it and may as well change the reservoir if that's the only way to do the filter, at the same time as putting on decent hose clamps/inspect hoses etc. Again - thanks for the info.

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08/06 build 4.4i Stirling Grey over black