Looking for rubber rejuvenator.

I have seen several cars and trucks that the black rubber trim looks blotchy like fungus or bacteria is eating on it. Scrubbing with comet and a rag helps a little but not much. So far all I have used silicone based spray and back-to-black with little change.

Is there any way to restore the damaged rubber?

Ron:
I have never heard of a product that will bring life back into rubber once it has begun to deteriorate.

The best you can do is replace it and use product to help slow down the deterioration.

You may want to use 303 Aerospace protectorant. I use it after every other car wash.

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2004 SLE Crimson Tintcoat with Dark Pewter Interior. Mods so far: Wood Dash Kit-Window Tint-CATZ Fog/Driving Lights
Custom Fabricated Stainless Steel Mesh Grill-Painted Calipers-3rd Brake Light Decal-Strut Tower Brace.INTENSE™ Level 1 L36/L26 Performance Package, Intense Shift Kit. ZZP ER Rockers and a HV3. L76 springs
COTM April 2007

You could try back to black, depending on how bad it is, it might work in a marginal way.
Door trims and such I use AC Delco door seal lubricant, it brings back some shine, and moistens the rubber as needed.

However, as stated above, replacement might be the best bet, to get the perfect look.

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2016 Dodge Charger Scat Pack 392
3.09's 8 Speed Auto
04 GTP

Matt, re read the first post

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2009 Phantom Metallic G8 GTS
Appearance; Custom Engine Cover | HSV GTS Spoiler | GXP Front bumper | GXP rear diffuser | HSV GTS Triple Gauges with Dash/Console conversion(First in North America) | HSV GTS Sport Steering Wheel | 20% tint | Holden 6.0 Litre V8 Badges | VE Chrome Lugnut Caps | Blacked out Window & Grill Chrome | V6 door handles | Tinted Tails/Front Side Markers
Performance; Roto Fab CAI | SLP PowerFlow axlebacks | X-Pipe(mid muffler/resignator delete)
Handling; XA Coilovers

12.9199 @ 106mph
1992 SSEi