Any product that’s used on upholstery without an extraction machine to remove it (along with the dirt) isn’t really doing the job properly. It’s just moving the dirt around, not removing it.
You could rent a RugDoctor machine and use the hand attachment that comes with it.
But unless you need your house carpets cleaning as well, that will cost almost as much as getting a Valeter round to do the whole car and have it spotless.
I would have charged (when I was Valeting) something like £60 for a full interior/exterior, wet vac/extraction machine, wax, polish etc etc.
And with a van full of expensive machines and all the chemicals you could ever need, and the experience to know how to do it properly, it would be spotless afterwards !