Sorry for such a long issue report. I tend to ramble (oops). I am absolutely loving all the tools you guys have set, but it would be great if the full suite of Kali tools were available. I was going down and compairing the list here: http://tools.kali.org/tools-listing and noticed there were quite a few missing! I also noticed you have many tools they have, which is great!
Dry cleaning is any cleaning process for clothing and textiles using a chemical solvent other than water. The solvent used is typically tetrachloroethylene (perchloroethylene), which the industry calls perc or PERC.
The tannin stain is a very common stain found in dry cleaning. It is also a stain that you must be able to remove with a very high degree of success. By following these procedures you should achieve that high degree of success and be on your way to being known as the dry cleaner that gets the stains out.