First empty it out and determine what needs to be in there vs what’s just ended up there. I like handled bins for things like the tubes that don’t like to stand up on their own. Great for corralling that small stuff. I use a cart similar to this for doing IT work (installing hardware, patching from switches to ports, cross-connecting phone service, etc.) and it’s super easy for extraneous crap to end up on it. I have to tidy it up every month or so just for cable chaos.