I found the best method for cleaning the WeatherTech's is to use Westley's Bleach White with a stiff tire brush.
When dry, mist(small amount) some leather/vinyl cleaner on and wipe with a damp terry cloth towel. The cleaner gets the remaining dust/dirt that's embedded in the texture of the liners and leaves a slight sheen ***and it is not slippery like Armor All***.
Even after scrubbing the mats twice and rinsing them with a hose...the rag was still brown after I wiped them down with the leather cleaner. I used Meguiars Gold Class leather cleaner/conditioner
When dry, mist(small amount) some leather/vinyl cleaner on and wipe with a damp terry cloth towel. The cleaner gets the remaining dust/dirt that's embedded in the texture of the liners and leaves a slight sheen ***and it is not slippery like Armor All***.
Even after scrubbing the mats twice and rinsing them with a hose...the rag was still brown after I wiped them down with the leather cleaner. I used Meguiars Gold Class leather cleaner/conditioner