Well there are several different things you can do. The speed you want, and the volume you do will make a big differance, as well as budget if you are super broke.
1. Wipe with a clean cloth. Takes some time, works well enough with standard case lube, and wax, or allox bullet lubes. Takes a few seconds for each. If you use a Lee trimmer with the lock stud on a drill it goes real quick.
2. Steel wool, and a Lee Trimmer either on the Zip Trim (works like a pull string pecil sharpener.) or chucked in a drill. A few seconds each case.
3. Wipe with mineral spirits on a cloth. Kind of like number one. Just takes a bit for the mineral spirits to dry.
4. A vibratory tumbler. Pick your choice of media of corn cob, or walnut. A half hour or so does the job in most cases.
The only real equipment buy would be the tumbler realy. I have one. I use it to clean range pick up brass, and to remove the case lube from my brass. I clean 3 calibers of it as loaded rounds. It takes about a half hour or so to have it clean enough to not worry about.