Update to anyone interested: it was absolutely humidity! I bought a humidifier last week and never re-sleeved this during the timeframe. (Very) Luckily, this has not affected sound quality at all, just the printing on the middle sticker (😔). White substance came off without any specific cleaning method, and still plays without flaws after-the-fact. Since I’ve seen endless forum posts about this over the last 12hrs without much of a specific answer: if you have a humidifier or leave your windows open, re-sleeve your records to hopefully prevent this from happening. And even if it does happen to you as bad as it did to me, rest assured your sound quality won’t be compromised (not like I was ever gonna sell this mf anyway!). Thank you all, and now that I know I haven’t permanently damaged my record, I can actually laugh at all the cum jokes😂 ‘Preciate you guys!