If you tumble before decapping, you'll be putting in the elbow grease to clean the pockets yourself.

I use a universal decapping die in my old Lee Challenger O-press, always left that way.

After decapping, I use a Hornady Ultrasonic cleaner with 3 wash cycles using different solution mixes.

Then I inspect the pockets and necks to see if they need extra attention, brush if needed, then go to work.