It probably could do with a rinse but don't over do it, you would be surprise how much dust can settle without any real effect on the seeing.
Just fill the sink with some warn soapy water, swish it around a bit and rinse, and stand on edge to dry, if possible use distilled water to rinse, dosn't leave water stains as much.
That is the way i used to do mine and it work quite well.
leon
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