There is also the "suck it out" method, which many people have done successfully. This works best if there is a dished in area that does not have any hard creases. For small dished in areas a plain old plunger can do the trick. I've only seen it done once, and there are probably a dozen variations, but here goes. Put Vaseline on the plunger surface to make the seal tighter, then GENTLY compress the plunger on the dished in area by holding a small area of the lip UP so air can escape. Pull straight up slowly, and when you hear metal pop, stop pulling and use a finger to lift the lid until air can get back in. Inspect. If it looks great or "just needs a bit more pull" STOP. Sunlight and time will erase it 99% and only you will ever notice where it was. There are actually dent pullers specially designed to do this task, and they come in various diameters. Harbor Freight, or of course Amazon will have them, but you can also fill propane bottles at HF.
BIG DISHED IN AREAS - this fix may be on YouTube. Tools needed: wet-dry vac, tire inner tube slightly bigger than the dish, inflated but squishy, piece of plywood 1/4 to 3/8" thick that will cover the inner tube. Drill a circular hole in the center of the plywood that fits the hose of the wet-dry vac or is a bit smaller. Put the inner tube over the dish sealing it as much as possible. On a curved panel, lower the air pressure in the tube til it flexes. Place the plywood over the tube and press down to seal. Put the vac hose over or in the hole and suck the sh** out of it. Turn off, Remove and check the results.
INNER PANEL REMOVED? From the inside, push the dent out using a somewhat under inflated basketball [emoji459].
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