when I've wanted to clean off the dirt from mine before, I've just taken the hose outside, put the nozzle on "jet" and sprayed them real well. The jet setting is usually powerful enough to make a noticeable difference. Then I let them sit in the sun and dry - which of course wouldn't really work this time of year, but maybe place them by a heat vent in your house. I've even taken my "Magic eraser" to clean up the scuff marks along the base/outer sole of the shoe.

I hear mixed things about throwing them in the washer. Some say it doesn't harm the shoe, others say it does, but since you are retiring these and not wearing them for running, I don't see the harm in that either.

Finally, something I'm an expert on!

 

I basically live in old running shoes.  Here's what I do:

1.  While dry, I brush off any dirt and mud.

2.  If there are some stains, I put some of that pre-wash stain remover stuff and let sit.

3.  I take out the inserts and laces and throw it all in the washer with detergent in cold water at the longest cycle.  (A little baking soda is also useful in neutralizing any odors, I've been told.)

4.  That usually does the trick, but if they're still not clean enough, I've done another wash in warm water--but that can cause them to shrink a bit.

 

ETA: air dry only, of course.  Crumpled newspapers in the shoes will help absorb moisture, if you're in a hurry.

 

Good luck!

 

 Ditto

I could wear a different pair of retired running shoes every day of the week

Finally, something I'm an expert on!