Clay mitt vs bar(?) [update]

I’m turning in my Pacifica lease soon and want to give the paint some attention. I have some clay bars already and some spray lube ( ͡° ͜ʖ ͡°) but it’s a huge minivan and have a lot of surface to cover.

Should I look into a clay mitt for time savings? Or do they actually save time?

Side topic. What’s a good synthetic sealer you all are using these days? My supplies and information are both old and I feel like I’m out of the loop.

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ETA: I feel I should mention why I would fully detail a lease return: I have some positive equity in the vehicle because of the miles I haven’t driven, and I want the highest chance at getting that equity back in the form of a check, so I figure some extra elbow grease to make the paint really shine would be worth the effort. The interior still looks new (white leather with 4.5 kids; it’s a miracle it survived so well.)

That’s not a Porsche, but now I want Doritos for some reason.
That’s not a Porsche, but now I want Doritos for some reason.