Having 8 toy poodles at one time, & an old 2 story house, I needed a carpet machine that was easy to carry around & use. I also have a big floor model, but the hand carry smaller ones do great for spots. Check the Bissell portable spot machines. The ones with 2 tanks. Walmart would have the cheapest price I think. I've used these for many years.
https://www.bissell.com/carpet-clean...arpet-cleaners