what has worked for me in the past, growing up on a farm and using them, go to your local farmer coop store, get a bottle brush for calf bottles. they are long, the brush pole you can bend if you need, the bristles are wide, and sometimes fine for getting that little tiny bit in the corners. they have worked wonders for me in the past with a little bit of that purple juice. if you rather not go that way, somthing else i might try is sand. you want something finer to scrub a little better. rocks and "pee" gravel will get the larger chunks of stuff if you had scale build up in there. but you will see scratch marks thru the crud where the rocks never "scrubbed". after a good scrubbing, and all the oil and crud is out, and it is still discolored, maybe try a little bit of bleach in there? not sure how that would work in a burp tank. always seems to turn my cloths white.... LOL. hope this has been of some help. dave stohler camp taji iraq --------------------------------- Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates. _______________________________________________ AMC-List mailing list AMC-List@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list or go to http://www.amc-list.com