RepairPal Certified shops can diagnose and repair your 1993 Chevrolet Caprice. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
I would use simple green or ammonia and a soft cloth. Avoid harsh chemicals. There is a coating on the inside of the throttle body that resists sludge buildup. Harsh chemicals can remove this coating. Thank you, david@apexautoaz.com