I can ask a friend that has used it this year on his front pan when the sap wasn't running during a cold spell. He said that it cleaned up the pan really well and didn't take long but then again there wasn't much sugar sand buildup for either of us this season until the last week or so. I'll find out if he diluted the white vinegar with some water or used it straight.
I finished up with 355 gals. made. Ok, but not any where's near the 1/2 gallon per tap that some make. It was all dark or better grade.