If you have starting reloading and can't afford a tumbler or if you have large quantity's of brass to clean in a hurry then please watch this video showing in real time how i clean my brass.
All you need is a large sink or bucket,
Citric acid $8
Earthwise dishwashing powder $10-13
A heat source , I use the oven but food dryer or leave them in the sun.
Backing soda ,If you are concerned about any residual acid left on the brass.