User`s guide

Which Cleaning Procedure should I use ? Cleaning Information
Agilent 81618A/9A and Agilent 81623B/4B/6B/8B Optical Heads, Fourth Edition
95
An Alternative Procedure
A better, more gentle, but more expensive cleaning procedure is to use an
ultrasonic bath with isopropyl alcohol.
1 Hold the tip of the connector in the bath for at least three minutes.
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 any remaining lint with compressed air.