Agilent Technologies 86038B User Manual page 324

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Alternative Procedure B
If your lens is sensitive to water then:
1 Moisten the lens or the mirror with isopropyl alcohol.
2 Take a new, dry soft tissue and remove the alcohol, dissolved
sediment and dust, by rubbing gently over the surface using a
small circular movement.
3 Blow away remaining lint with compressed air.
Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition