For seats there’s a rubber brush you can use that’s pretty effective at removing hair.
If you’re trying to remove it from the carpet, there’s a product called the Furz off stone. It’s just a big piece of pumice. Works great! Floors only, could damage seats.
I hear you! You may want to look into a deionizer. They aren’t terribly expensive. Use it for your final rinse and let it air dry and you have a spot free wash without drying by hand.
In my humble opinion I believe they both have a place in the detailing world. For a number of years I had exclusively used a Dewalt 3400 psi gas power washer. It’s very powerful, easily removes dirt and grime. Unfortunately, it’s loud, expensive to run (using TruFuel) and a bit overkill for...