Again, it's *my* concern that silicone or PTFE, even in modest amounts, might make the grip area of the camera slippery. I've used these kinds of products a lot and would not want them on an expensive piece of gear I would rather not drop. In addition, those products often are combined with a solvent vehicle that, as unlikely as it may be, could migrate to the adhesive under the rubber.
Baking soda, or other odor absorbers like activated charcoal, work by absorbing the odiferous molecules circulating in the air--they won't deodorize the item giving off the odor. Putting baking soda in your refrigerator with stinky food may make the air in the fridge less stinky, but the stinky fish will still be stinky. The odor won't be "pulled" off the fish. Ditto the camera.