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The Cessna manuals call the vibration dampening pads "Soundproofing". They are located all over the airplane. There will be a figure in the Illustrated parts manual with all their locations. (I'm missing that figure. Could someone else post it?)
Remove an interior panel. Behind the panel will be a layer of insulation. Gently remove whatever insulation is there; you may want to put it back. Behind the insulation you'll see the skin of the aircraft. Glued to the skin will be the black soundproofing pads. They're contain lead and they add a small amount of mass to the skin to reduce vibrations which create sound.
The attached photo shows the pilot-side wall of the baggage area. On the right, is a black soundproofing pad which is intact and well secured to the fuselage. On the left, is the white aluminum corrosion that was behind a rectangular soundproofing pad which was removed. The shiny spots show where there was no corrosion. With some effort, the corrosion cleans off back to shiny aluminum metal. Once clean, the metal can be treated to prevent further corrosion.
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