(I am loath to start new topics, when there are so many excellent ones already)
This thread popped up on top when I looked for stain removal, so figured this would be the appropriate spot for it. This may or may not be useful for GF issues (but who can tell, I just came across mustard, the yellow poopy stuff in threads, on calipers 
)
So -
An extensive collection of stain removal solutions:
https://extension.illinois.edu/stain/