If you had your transmission housing, starter, mounts, and/or mounting bolts ceramic coated, you'll want to use a stronger wash or other chemicals to reduce or remove it. Alternatively , just go straight to using compound for removal.
Kidding aside, you posted in the detailing sub-forum and, like Dr Ferry said, it sounds like you used the wrong bolts. While I don't have a 6-series, I don't believe the starter should wiggle.
It's worth confirming that the mounting hardware you used were the correct ones. If not, most bolts are fairly cheap (aside from those cursed underbody reinforcement plate bolts) but, once you remove the current bolts, I'd check to make sure the mount or housing threads are not damaged.
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