I would think that using a cleaner like bleach is a part of your problem;
I wouldn't use any cleaning/corrosive agent.
As mentioned, using harsh cleaners can make the black wall look terrible.
What I have done in the past with these is simply water and a green or blue scouring pad - it's a bit tedious, but the results are worth it.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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