There is one video on youtube. Think it might have been the CRA/USAC showdown in the 90s? That shows them dumping bags of powder onto the track in a daytime race at Terre Haute. Not sure what it was but they were dumping it straight from the bags.
Staab always swore Mel Johnson at the Burg would dump detergent in the water truck and it would keep the track tacky but greasy back in the 80s. Said it was never the same twice. But you could go out after a whole night of racing and it would still suck your shoe off and you could see where the clay just kept rolling every time a car leaned into it. Usually with a 2ft curb at the top.
Of course the track sat in 4ft of water all winter and the water table was only a couple ft below the track at most times of the year.