

I don’t think your premise is correct. From memory, and scanning a couple episodes illegally uploaded to YouTube, it doesn’t look like Captain Planet flies away at the end. Usually, the scene just transitions to later after he’s gone, but the few times we see it, he dissolves into light, presumably returning the rings powers to the planeteers and disincorporating. He doesn’t go anywhere, he bodily ceases to be.
Where does his mind go? I think he’s a spirit. Where does team spirit go after the football game is over and everyone goes to bed? It still exists, but it’s not… here. It has to be activated to be tangible.
Soap is extremely moldable and formable, which makes it reformable too. All the scraps can EASILY be reused without loss of quality. You can do the same at home— shred the soap ob a cheese grater or food processor, melt it in a cooking pot on the stove, pour it into the mold of your choice, pull it out and you have soap of the same quality as before in a new shape.