Similar topics have been posted before, but I wanted to refresh the topic for anyone hoping to do some spring cleaning. The washing machine does wonders for floor mats and it means you don't have to scrub your arm off trying to lift out the little bits of sand and dirt. Pre-soaking/rinsing the mats and washing with hot water to keep them flexible has been mentioned as working the best by some other members. People with lighter color floor mats probably know and are frustrated with how hard it is to keep them clean.
Here'* how mine turned out today:
They weren't overly dirty to begin with because I washed them about a month or two ago, but decided to do it again since I had the chance and will be busy until summer basically. I wish I would have started doing this sooner because maybe I could have lessened the staining on the driver'* side. Nonetheless, I like how this works. Mats are still damp in the "after" picture so they should look more improved after dry.
Before

After

I see hardly any difference

Good job keeping them clean to begin with...

Haha, thanks. Yeah not the huge diff people wanted to see I'm sure, but you really have to try it and see to believe yourself. Promise you won't be disappointed.

spraying them down with simple green and clear water power washing at the local self service is faster and I think gives better results. (easier on the washing machine too)
Just my opinion.

Good color for hidding dirt though.

I tossed mine in the washer...

They went from black to tan... AMAZING difference

I used a can of Turtle Wax Power Out! Carpet cleaner and made a huge difference. Looks good, adn you can always rotate the mats if one'* getting dirtier than the other like yours are.

im pretty sure the only time thoes 40th mats would be in my car is in the summer...and then even if a drop of rain hits the ground they would be out