Yellowing White walls cleaning or other methods

Patty, recently posted this question. I was late in replying so I did some experimenting using the Bleche White and absolutely was in effective. I mentioned I was going to try acrylic vinyl paint. I did try painting over the white and it came out pretty good. I am including a photo of the product and photos. The yellow ones on top and painted ones below. The photos are not crisp enough but the is definitely a difference.