You can clean them and like use it again?

Jeez, I’ve just been buying new ones!

How I clean my shotgun depends on what I have been doing. I have been shooting plastic sabots out of my rifled slug barrel, I apply a solvent to the barrel which can remove plastic fouling and then proceed to run a brash brush and/or patches through the barrel until clean. Last two passes are a patch with heavy oil and then a patch with no oil.

I honestly have not put enough shells through my shotgun to justify disassembling the receiver and cleaning the internals so I have nothing to add in that regard. (Hint: shooting 300 grain slugs with 2,000 feet-per-second muzzle velocity out of a light pump-action shotgun generates brutal recoil and bruises your shoulder–it is next-to-impossible to shoot more than a few dozen of those over the course of a few decades.)

(I laughed out loud at your comment Dude!)