CRT boards smell bad after cleaning off flux, anyone know why?

[Alex KL-1]

Originally Posted by Alex KL-1

Even some PCB have some characteristic smell.
For non-SMD boards I wash using paint solvent ("thinner"). Makes good against normal solder flux. Caution for not spilling it ont eg. styroflex caps, since it is aggressive.

The method I prefer for washing: I put the board in vertical plane, for not accumulating dirt and even the thinner.