Dave's Insanity Sauce? Geez - not heard about that for years. Had a bottle I brought back from Atlanta in 1999 and it lasted for ages as you use so little!
Does it still have a warning on the side? Something like "Cleans oil stains off driveways, not to be taken if you've a heart condition" etc?
Mental stuff. Going to have to go to Asda if they've started stocking it!