Did you ever see what a pint of Guinness does to a mixers insides ?
its has iron in it and is way more conductive than beer , if you dont shut the power down before the liquid hits the pcb its like throwing a crowbar across the PSU rails .
Ive a small Uli Beh mixer for around 25 years , guy who bought it off me spilled his pint of black stuff on it , our tech department said it was unservicable , so it ended up with me ,
Took a few good washings down with finest 80+% moonshine , a shorted op amp in the aux return path desoldered and it worked again , led meters remained funky ,so what ,
I use my ears not my eyes to detect objectionable distortions .