The FSM procedure for replacing the CDI glow plugs specifies using a pair of cylindrical brushes, 6mm and 10mm. So I got a set of brushes. What about also using compressed air to dislodge the carbon? Any downside to that?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles
06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 72k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife