Jons:
I also remember the Wisk powder. I thought it did a pretty good job of cleaning. The last box I bought was in '97 when I moved here to Springfield and I had to do laundry. I don't know how much longer it was on the market after that, but it just seemed to disappear from the shelves.
Do you (or anyone else for that matter) remember Wisk tablets? Tide and Purex also had these, but due to low consumer response and lousy dissolving in cold water, they were discontinued.
Wisk products had always been made by Lever Brothers (now Unilever) and based out of New York. I remember on the back of detergent boxes in the 60's, they used to have a drawing of a tall building as part of their logo. If anyone should have a box from that era, can you take a picture of what I mentioned and display it?