Ahh yes, you're talking about Skeleteens Blue Brainwash. It stains not only your feces and urine blue but basically everything it touches. Your mouth will be blue, your fingers will probably turn a shade of blue, and yes your feces and urine will be blue. You can buy it at :
http://www.sodaking.com/product_info...roducts_id=399 . This stuff was great back in the day.
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The following review was copied from page 142 of "The Cyberpunk Handbook" by St Jude, R.U. Sirius and Bart Nagal. A fine little book (even if a little dated[Read:1995] by now), go and find it if you can.
"But for special occasions, the ultimate softdrink has to be navy-blue Brainwash. Read the label. You'll notice many misspelled Chinese herbs, two kinds of chili peppers, and other powerful yet legal ingredients that just won't leave you be. You’ll pace, rant, stay up all night. The Skeleteens make other brain-slamming softdrinks, but Brainwash is the mightiest. We don't know the Skeleteens, and we hope never to meet them. They are probably very scary."