GMC 1994 Sonoma Owner's Manual page 281

Cleaning Vinyl
Use warm water and a clean cloth.
Rub with a clean, damp cloth to remove dirt. You may have to do it
more than once.
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Things like tar, asphalt and shoe polish will stain if you don't get them
off quickly. Use a clean cloth and a solvent-type vinyl cleaner.
Cleaning Leather
Use a soft cloth with lukewarm water and a mild soap or saddle soap.
For stubborn stains, use a mild solution of 10% isopropyl alcohol
(rubbing alcohol) and 90% water.
Never use oils, varnishes, solvent-based or abrasive cleaners, furniture
polish or shoe polish on leather.
Soiled leather should be cleaned immediately. If dirt is allowed to work
into finish, it can harm the leather.
Cleaning the Top of the Instrument Panel
use only mild soap and water to clean the top surfaces of the instrument
panel. Sprays containing silicones or waxes may cause annoying reflections
in the windshield and even make it difficult to see through the windshield
under certain conditions.
Care of Safety Belts
Keep belts clean and dry.
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