I have a neat tool for this. It's a pressurized fuel injection cleaner with an atomizer attachment that mounts in the intake boot, downstream of the MAF. You fill it with induction system cleaner, block the pedal to run the engine at about 1600rpm, so the throttle plate opens and let it run until the canister empties. Probably not as good as removing the manifold and cleaning it thoroughly, but it saves labor.

I bought it to decoke my kids direct-injection A4.

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12 E70 3.5i xDrive
03 E46 330i ZHP
01 E53 3.0i
98 E36 323is
12 Audi A4 Quattro
79 Triumph Spitfire
73 MGB