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

[CRTguy]

Originally Posted by Findm-Keepm

No brush needed, fumes only when wet, and very mild!

https://mgchemicals.com/products/sol...for-pc-boards/

91% IPA if I run out - and sparingly, as I use Kester 44, so no added flux needed. Same stuff all micro-min soldering shops used in the Navy.....Kester 44 in .031 and .020, i also have some older Kester 33 in .031 and .062

https://www.amazon.com/Kester-24-633...149K4JTY&psc=1

I had always used Kester 44 for soldering and it works great but I ran out and made the mistake of buying the much cheaper Chip Quik solder which works but needs added flux to make a good joint. The Chip Quik solder is what I used to re-flow the joints on my Hitachi boards and why I had so much flux to clean off because I had to add so much flux. Going along with what you said, I never needed to add flux to Kester 44 to make a good joint.

I also used the non aerosol version (4140A) of the MG Chemicals flux remover you linked to, to clean my TV boards. The product page claims it's low odor but it has a terribly strong odor that lingers for hours in the room it's used in. Using it outside wouldn't be an issue but I had to use it indoors recently because of the snow.