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I'd take all of the carpet out of your trunk and shampoo it. And wipe down everything under the carpet.
FYI...octane booster is bad news, I would NOT run it on an M3. I saw the guts of a Subaru motor that had used octane booster with every fillup and it was all orange and nasty from the octane booster leaving deposits and crap. Just suck it up and deal with 91oct or else buy some 100oct to put in your garage and mix with the 91.
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