Did someone work in the engine bay (open hood) and leaned over the engine with hands on the fender with brake fluid all over or some other kind of chemicals? Just brain storming here

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His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
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Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci