How can I clean a smudge of Velapa off an objective lens?

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Jens Rietdorf

you can always try ethanol but I would expect little success. wash petrol as available from pharmacies and is a good choice for cleaning wax. Never use acetone.

Jahja Kokaj

How about using ultrasound technique ( apparatus).

Arjan Barendrecht

We use 85% refined petrol, 15% 2-propanol for cleaning objective lenses.