" Maintenance is not my favorite activity "
well. ok ...
being a journeyman maint tech, and moving past the part of me that draws the line at not dating people who state things like "bathing is not my favorite activity". there are things you can do to back yourself out of the problems that you've caused.
to disassemble stuck things made of aluminium, it can help (in order of severity) to run them under scalding hot tap water, submerge them in even hotter boiling water, heat them with a propane torch, and about that time you are running out of thermal options as alloy melts pretty easily.
but, as advised, soak them in penetrating oil and let them sit (easy). then get to work with heat and twisting.
in a perfect world they will soon enough yield to your new, more maint oriented efforts, and you'll then "want" to render them properly clean.
the nicest way to do this is with a bore brush. sold at better gun stores, you'll find them avail in a multiplicity of sizes. they are plenty long enough to get as far as you need to get inside the tubes. also avail at McMaster Carr (and what isn;t ...).
after you learn the wonders and benefits of performing regular maint on your gear, your life will be better, people of all manner will find you desirable, you'l look Hella Better, and butterflies may stream from behind when you break wind.
good luck !