The first time I cleaned my carpets I used a Bissell Little Green Pro with Oxy shampoo. The most recent time (last Saturday) I used Chemical Guys Foaming Citrus Fabric Clean. Right now the citrus smell is still too strong to tell if it worked but I think I am still picking up the old musty odor as well. I also cleaned the seats and headliner.
https://www.amazon.com/gp/product/B06XPSP2HS/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
I actually just got the Fabric Clean by CG as well!
What did you use to agitate the shampoo?