Importance of a clean chassis

[zenith2134]

You're talking to a guy who takes this very seriously ... I routinely disassemble most sets and scrub down the board after touching up sketchy solder joints. 91% isopropyl on the foil side (with toothbrush)to de-flux the work.
Around the HV cage of even a modern crt, there always seems to be dust buildup. Blow that out with canned air ! It works a charm.