Yellow Wall experiment

[ALANSD]

My 78 Sovereign project has been held up by the yellowed bedroom area walls. The po painted the front living area ( yucchy off white, being redone), but the bedroom is amazingly disgustingly yellowish brown. When we pulled off the pad on the mid-wall to redo it, the contrast was strong, between the original (covered up) silvery-grey and the exposed yellow mess.
I have read tons of posts on this and nothing worked. Sorry, a combination of age, cooking, maybe smoking although no odor was detected, and the leeching thru of felx agents made this a tough job.
Determined as I am not to paint or strip, I tackled this using a line of cleaners starting with the mildest and going to the strongest ...see photo, though not in order in the picture, I used
Orange Cleaner, Tuff stuff upholstery/vinyl cleaner/ windex/ Grease Lightnin'/ Awesome ( a great cleaner for 1.00 from the Everythings a dollar store).
Then graduated to Armstrong Vinyl Floor stripper/ Hot Shot / Zep Cleaner/ Castrol Super Clean ( now sold as Super clean no Castrol name anymore...purple and strong stuff)
Lastly after some improvement, very clean and shiny but still yellow walls, I got a spray bottle and filled it with Outdoor Clorox Bleach ( for plastic furniture) and about 10%-20% water.
The results are in....finally most ( not yet all) of the yellowing is gone.
I soaked, scrubbed with a stiff brush, washed it off with a wet cloth, soaked and started again three times so far.
It is a noticeable improvement.
If you are going to tackle this job, I suggest you start with a good cleaner like the Super Clean, then go roght to the outdoor bleach, being sure to cover or remove everything you don't want this stuff on.
Rubber gloves, mask, and good open window fresh air is a necessity.
The photo shows the "before" .... I will post the after later....