9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
Both were dirty, the throttle body especially so.
Grabbed a can of Wynn's Throttle Body & Carb Cleaner
... ripped the throttle body off (took just 5 minutes, expected it to take longer!) and covered it. The crap/gunk just fell away; it's good stuff.
You need a 10mm socket & a flat-head...