Unless you are shooting long range high power matches it isn't necessary to clean the primer pockets, most shooters can't shoot better than their equipment and won't know the difference. I shot pistol competition for years (Master class) and never cleaned a primer pocket, nobody I knew did it either. When you are high volume reloading you don't do things that don't really serve any real purpose.
It's fine to deprime before cleaning, but...you shouldn't really resize dirty brass, it will scratch up your dies, and scratched up dies will scratch your cartridge cases, if you have any pride in your reloading you don't want grubbly scratched up cases.
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