1st set, for my 'new' 2007 Mazda 3. WHat does everyone clean then with. WeatherTech sells some pretty pricy stuff. Mine are black, if it makes a difference.
I do not have weathertechs but I thought I would at least tell you what I have found works easy and cheap. As long as you don't spill crazy sticky stuff on them I've always had extremely good luck with just hanging them and pressure washing them with the soap setting at the self wash. Followed by a good coating of 303 aerospace protect to keep them mint and let future spills wash off even easier on 24 year old OEM winter mats; they are very clean and crisp for the age.
I use Tuff Stuff multi purpose foam cleaner on stuff like that, you can probably even hose them down with good pressure nozzle if you have deep pockets that are hard to get to with a cloth.
After ya clean them with whichever product, give them a coating of a protectant such as 303's. I just did my spring cleaning and used TechCare's Floorliner & Floormat Protector on mine.