Content provided by Michiel Meyer, hosted with permission

I used to prefer to clean my cases after it was resized with a sonic cleaner, but I have changed the way I'm cleaning my cases before reloading to prevent the die from scratching due to sand or other impurities.

First tumble, then re-size, then inspect, then sonic clean.

A sonic cleaner cleans the entire case (inside, outside and primer pocket) If you use a tumbler to clean your cases then a lot of shooters prefer to clean them before the resizing stage as some of the media will block the flash hole after cleaning it. This tumbling media is easily removed during the resizing / decapping stage. It is not critically important to clean the primer pocket at all.

Batch of un-cleaned brass

After decapping the brass, it goes into a sonic cleaner for 560 seconds. The mixture I use is made up of 2l hot geyser water (not boiling hot!), ¼ teaspoon citric acid, 50ml white vinegar and a good squirt of dishwashing liquid

After removing the brass from the sonic cleaner, make sure to thoroughly flush them with water before allowing them to dry.

Cleaned, but wet brass now looks like this.