The oven cleaner cycle was a good idea for the resin - I’m not sure what else would have worked - but it won’t do anything more to what is already basically a form of graphite (which has an extremely high melting point, and a fairly high ignition point).
You need to oxidize the carbon. That would be bleach or hydrogen peroxide + time and, if you can, sunlight (so set it outside to soak for a bit with this stuff). This is gonna take several hours, and it may take more than one round to get all of the scorching off, but it will come off completely if you are patient and persistent enough.
EDIT: Though the method I’ve described is what I’ve done in the past, I read that heat + baking soda + water (+ vigorous scrubbing) can also work.
Sway is basically i3 but for Wayland, so guides for i3 may be somewhat helpful for you.
The man page is probably also worth a read: https://man.archlinux.org/man/sway.5
Short version: Sway/i3 doesn’t merely allow you to control your WM via hotkeys, it requires you to. Unless you know/have configured the hotkeys for opening a terminal or an application launcher, you won’t be able to do anything. As such, you are looking for a guide on how to configure Sway, rather than on how to use it. Once you know how to configure Sway, actually using it should be immediately obvious.