Hi,
For safety reasons, everything I have ever read about cleaning seat belts says to use a mild soap solution and thoroughly rinse in clear water. This is to assure that the Cleaner does not degrade the Nylon Belt, possibly weakening it. Never use a strong cleaner, petroleum based products, or bleaches.
Following this recommendation, I guess the best way would to be removing the Belts and soaking them in a Woolite solution overnight to float the dirt out.
I realize how impractical this method would be, especially on a continual basis. So, if you want to preserve the integrity of the Belt, unfortunately I'd say it's something you may have to live with and just be satisfied to clean them as best as you can. Sorry...
Happy Motoring!... Jim'99
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