Both the Folex and Zep carpet cleaner are very low foaming. I couldn't really tell much of a difference between the two of them as far as cleaning power. Except that I used more product with the Folex cleaner and it's much more expensive on a per ounce basis. So I'd use the Folex for spots and not as a carpet cleaner. Also with Folex after spraying the spot it says to work the product in with your fingers. Also the Zep contains a stain blocker so I think it's good to follow the directions, dilute it down then extract it with hot water.
I rented the Bissel Big Green at Lowes. It's hard to over-wet anything since the vacuum is always running when you turn the machine on.
2012 Toyota Camry 71k-PUP 5w20,OEM filter, RT43s.
2005 Toyota Matrix 135k miles - VWB 5w30 conv, Valvoline oil filter. Nokian eNTYRES.