The first time I requested this, shop charged me extra for cleaning all the brake dust off the insides of the wheels! I'd never cleaned that part of my rims before. Now whenever I take off a wheel, if the inside of the rim hasn't been cleaned in a while, I give it a good cleaning before re-install.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC