I done something similar - the one day I wanted to be nice and bring people at work some coffees, the lids weren’t on properly and all 4 lattes went over the passenger seat. Every little drop onto my alcantara...
Invested heavily in A LOT upholstery cleaner and thankfully the dead milk smell only lasted a few days. Must’ve emptied all the seat cleaner stuff I bought onto the seat and refrained from rubbing anything in, with the hope it would bring everything to the surface.
All good as new now
And my colleagues will never get drinks from me again
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