By far the most dirty job when doing a playfield swap is cleaning the wiring harness.
Anyone who has ever tried to take a shortcut and skips this step, quickly finds out what a mess black fingerprints make on every part of the playfield and rubber.
The coil dust is carbon, iron and lead, so wear gloves.
If you blow some of the loose dust off with an air compressor; do it outdoors and downwind from your garden.
DO NOT blow that dust indoors and permanently contaminate your basement/garage.
Be forewarned, people view their established cleaning routine with an almost religious fanaticism. Toes might get stepped on. Defense mechanisms will be on high alert and trenches will be dug in.
It will all be OK, I promise.