Well I wouldn't use real dirty brass and I've always cleaned the brass after use. Part of the reloading process for me. If you wanted it easy, you'd just buy factory loaded cartridges and avoid all the reloading.

Before I got a tumbler, I put the brass in a bucket with some water, some white vinegar, a little salt, and a little hand dishwater soap. Move the brass around a few times, and let it sit for about fifteen minutes. After that I'd take the cartridges out and dry them on some newspaper. It might not be the brand new look after a few uses, but it would be clean for some good reloading.