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Takahashi had a write up with its scopes and there would be other resources on the net.
Here's the procedure I have used many times that works well:
1. Hurricane blower, blow loose girt and dirt as much as possible off the lens. Pull back dew shield if it retracts.
2. Using cotton balls and Bintel lens cleaning fluid (its really good and streak free), daub the cleaning fluid onto sections of the lens. Chnge cotton balls regularly. Best to do a quarter of the lens at a time. You want to get the grit and scratchy stuff off here and stains that are easily dissolved. Get the lens a bit wet but not running off down into the cell.
2 With nonscented white tissues, wipe a small section and dispense of tissue. Change tissues constantly. The risk is some grit gets on the tissue and you wipe and scratch. So change often. Wipe in small areas and take it to a streak free finish. You may need to do this step a few times if its really dirty.
3. Do the same for the other quarters and a final look at the lens from a backlit view and see any streaks, bits missed and clean.
If the cell was tight a spray of distilled water with the lens pointing towards the ground somewhat may get dust and grit off early which would be good. You'd have to be confident water wouldn't penetrate the cell and go between lenses though. I use washing like that for exposed mirrors not refractor lenses.
Greg.
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