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that is a very simple answer. Locally the highest grit available is 2000. If I want higher grit I have to either wait until I travel overseas or have it sent from Canada. Up to 2000 has worked ok...

you have that right. You just don't always need to lap them. Often they are fine as found. Once you have started you need to take it too the end. I only lap to 2000 though.

I may be a philistine but I often give them a short scrub with soft scrub or vim cream and a nail brush. I would try not to be very vigorous, and if you have a scotchbrite that is safe for glass it...

that is how it is done. If there are no chips, scratches or warps I have no idea why you would put yourself through that. If they are flat and smooth just give them a quick scrub and use them.