Cleaning mildew-ridden shoes

Somehow mildew keeps creeping into my shoes and then spreads to my other shoes.  Cleaning them turned out to be a huge headache and I dislike throwing away almost-new shoes.

After many failed attempts (detailed below) the following tactic worked.  This damaged the pair that I used it on but as they were white running shoes and the material under the first layer was also white, I didn't mind.

• Get a high-percentage Isopropyl rubbing alcohol.  I used 90% alcohol, 10% water.  You can buy this at almost any grocery store or Walgreens/CVS.
  
• In a well-ventilated area or outside and FAR AWAY from open flame, douse shoes in the alcohol.  They should not be soaked, but you should be damp.  I used about 1/2 cup on each shoe.  Might not need this much.
  
• Wrap in two plastic bags. 
  
• Wait a few days.
• Open the bags (which will stick a little to the shoes), set the shoes -- as open as possible -- in direct sunlight for another day or two.

(Stuff you can do with the left-over rubbing alcohol.)

Failed attempts:

• Soak in soap for 3+ days, leave out in sun for several days.  Smell came back almost immediately.
  
• Soak in diluted chlorine-bleach for 2 days, leave out in sun for several days.  Smell came back almost immediately.
  
• Anti-mildew spray I bought at Home Depot: Concrobium Mold Control.  Worked for a few days, then the smell just came back. 
  

I did not try this, but might soon.  Feedback on this process is welcome.