My only recommendation would be to use something like Scotchguard. It might allow you to keep it cleaner, or at least clean it so that stuff doesn't set in.
------------------
'02 SS EX-L RES on
order, build date 10/28 (Sunday?)
'98 Explorer XLT
'94 Prism Lsi
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'02 SS EX-L RES on
order, build date 10/28 (Sunday?)
'98 Explorer XLT
'94 Prism Lsi