Yes, discussed a few times in the past on CCF. If you use the search box in the upper left hand part of your screen with the keywords EXPERIMENTAL RINSE, you will find them. Also, here is a link to a pretty good explanation of the experimental rinse (compliments of @john1):
http://www.smalldollars.com/dollar/add002.html
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz