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Huge improvement. Stripped it down and started again. Surprising how much microscopic contamination is left behind by microfibre cloths. I washed the lot thoroughly and used isopropyl alcohol as a cleaning agent. No smears and no dust... except the inevitable accumulation on the face of the low pass filter. Alcohol seems to act as a mild anti static agent.
Thanks Leon for your advice.
Last edited by rcheshire; 25-11-2011 at 09:41 AM.
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