Bear with me - I know what occured is fucking stupid, but I'm fucking stupid too.
I was watching a movie on my rig and accidentally knocked over a large beer bottle on the desk. A good amount didn't really touch anything important besides the mouse and some cables, but quite a bit managed to drip down into the tower that's mounted underneath the table on a shelf. It mainly affected the rear panel through the top fans, but leaked all the way down to the PSU shroud, touching the GPU in the process.
I immediately plugged everything off, removed the GPU and RAM, cleaned the obvious leaks and set the tower and the components in front of a pretty powerful fan to air dry. At least 24 hours have passed, I've got some isopropanol, brushes, q-tips, cotton swabs, an electric air duster and tried cleaning the residue. It's not really removed by the isopropanol apparently, especially where it's hard to reach among the capacitors and transistors. Cleaned the GPU and RAM in the same way, dusted them, cleaned the contacts that might have been affected.
It boots up and doesn't seem to be affected much, so far. But, since it was a carbonated drink that has dried on the surfaces, the contacts and traces - how likely are they to eventually succumb to corrosion and oxidation? Is there any mild contact cleaner I can use to prevent that?