took my egr off today black with muck! but not very bad to be honest,cleaned it wit brilo,degreaser and fairy liquid,then dried it off and sprayed the inside with wd-40 AND left off the car till sunday when i re-fit it with ne w gaskets. Also cleaned the imf took it all off together. is this ok? its nice and lean now got it as clean as i could id say its now 99% clean. off A3 2.0 TDI SPORTBACK.