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It's not that bad to do.
I pull the plug and flush them with a gardenhose, with the tank on a plastic 50 gal garbage can.
Reach in with your hand and swab around with a rag. Maybe push it around on a short stick too, to get under the slosh panels.
I've made them with thin cork sheet, and other gasket sheet materials.
I've also reused the old(even if cracked).
Either way I seal both sides with a thin coat of Indian Head Shellac.