Deterioration as in the fabric backing is showing? Or a tear somewhere? Maybe a seam coming apart?
You can touch up a small area with either vinyl repair tape or a clear liquid vinyl cement. Both are usually available wherever glues and tapes are sold.
Otherwise, just wait til it gets bad enough and replace the fabric. It's a job many can do on their own.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL