HP 8168E User Manual page 228

Pipe-cleaner This is available from tobacco shops.
Ensure that the bristles of the pipe-cleaner are soft, so that they do not scratch
your device during cleaning.
Caution
Store your pipe-cleaners carefully and never reuse them as dust and dirt from
the air or from previous cleaning can scratch and dirty your optical device.
This is available from laboratory suppliers.
Compressed Air
It is essential that your compressed air is free of dust, water and oil. Only use
clean, dry air. If you do not, it can lead to lmy deposits or scratches.
When using compressed air from a can,
Hold the can upright. A slant can cause propellant to escape with the
compressed air and dirty your optical device.
Spray the rst couple of seconds into the air, as the rst stream of
compressed air can contain condensation or propellant. Any condensation
produces a lmy deposit.
If you are using compressed air from a can, you should select one with a
CFC-free propellant, for the sake of the environment.
E-2 Cleaning Procedures