Rules of cleanliness for working on automatic transmissions

WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Carefully clean all joints and adjacent areas before disconnecting.
Place removed parts on a clean surface and cover them. Use sheeting or paper. Use lint-free cloths only!
Carefully cover or plug unpacked components if repairs cannot be performed immediately.
Only install clean parts: Remove packing from replacement parts immediately prior to installation and not before.