Carpet Clean or New Carpet

[XanderWiFi]

So I have been pondering...my carpets are looking a little ragged and no matter how many times I use a home carpet cleaner or the can carpet cleaner they really never look that much better. I know a professional carpet cleaning can do wonders so I am curious as to what everyone's opinions would be regarding this matter. Professional carpet cleaning to try to revive the carpet and cloth interior or simply buy new carpet?

I spilled some protein shake on my backseat as well and it has milk products in it...I haven't been able to get out the stain and my car smells a bit funky as of late. Anyone have any products they would suggest?