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What I do is using some compressed air (which has much more force than a vac).
So from within the wheelarch remove the small panel, remove the rubber grommet, and blow some air through the canals.
I think you can even get in there from underneath (so without removing the wheel and panel)
That panel is officially there to disconnect the brake pad wear sensor/abs sensor
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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