HP 86140A Series User Manual page 278

3 Dry the inside of the adapter with a clean, dry foam swab.
4 Blow through the adapter using filtered, dry, compressed air.
C A U T I O N
Reference
Cleaning Connections for Accurate Measurements
Do not shake, tip, or invert compressed air canisters. This releases particles
from the can into the air. Refer to the instructions on the compressed air
canister.
6-20