Volkswagen Passat 1995 Official Factory Repair Manual page 1860

Multiport fuel injection and ignition system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.24.1
Rules for cleanliness
CAUTION!
Whenever carrying out work on the fuel
supply and fuel injection systems, carefully
observe the following five rules of
cleanliness.
1 - Thoroughly clean fuel system line and hose
connections and the surrounding area before
disconnecting.
2 - Place removed components on a clean
surface and cover. Use plastic sheeting or paper.
Do not use fluffy rags that could leave lint!
3 - Carefully cover over or seal any components
that have been opened if repairs are not carried
out immediately.
4 - Install only clean parts:
Do not remove replacement parts from the
packaging until immediately before they are to
be installed.
Do not use parts that have been stored without
packaging (e.g. in toolboxes, etc.).
5 - When the fuel system is opened:
Avoid working with compressed air whenever
possible.
Avoid moving the vehicle if possible.
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