Cleaning a HALFrack after welding - it's a tedious but not unpleasant process. Wire brush, deburr, file, sand, degrease, and wipe down.
I've said many times that producing a rack is only partly about making it - the actual fabrication is a small component of the process. Packing and shipping racks sometimes takes longer than welding them. This is important to consider when determining the true cost of producing something. If you're thinking about starting a business (I recommend it), do not ignore the many extra things required to actually deliver the goods. Consider in this case: a wire brush, emery cloth, files, acetone, rags, eye protection, etc..