-some people say you can use suction cups or a plunger to pull the dent. I couldn't make it work in this case, but it's easy and worth a try.
-if you can get behind the dent, you may be able to push it out
-You should try to pull the dent as soon as possible. If you wait too long, there will still be a trace of the dent when you pull it. Plastic creeps when it's under stress for a long time.
-if you use a ceramic flower pot for this, you might break it
-you may scratch the paint a little if you're not careful enough
-I imagine this process works on metal too, but I haven't tried it.
Step 1: Tools and materials
Tools and Materials:
-vacuum cleaner (ordinary household may work, or a shop vac, use the strongest one available)
-tape (duct tape or masking tape)
- flower pot or bucket with hole in the bottom. The stiffer the better, and large enough to cover the dent. If there's more than one hole, you can tape over the other holes.
-soapy water in a bucket
-towel you don't care about