I would like to get the headliner in my TD back to white, if possible. Currently it's on the gray side, but I know it was originally white. I want to avoid using anything that would ruin the material. Would a bleach based product be too strong. Also, what would be the best way to clean it, sponge, brush, etc? To me, it's amazing that the headliner is still holding up, pun intended.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member