[b]Rupe:

Thanks for testing the potassium permanganate.

First idea is that the Nalcool 2000, in spite of the very similar color, did not have potassium permanganate in it.

Additionally, the Nalcool did not have the slippery/oily feel of a soap, so I think trisodium phosphate also was not a part of it.

But a hot solution of TSP might be worth a try.

Bill.