I don't remember.
It was a long time ago that I used dish soap.

I do know that last summer when I had ants coming in my bathroom *right* before I left town - I put liquid dish soap on the legs of the table, but when I got back - it had run down and was non effective. Fortunately the ant spray I used in the plumbing (where they were coming in from) worked and they didn'y attack the tank.

I do remember that when my mom had ants attacking her dwarf citrus trees, she used some kind of paint or tape on the tree trunk that the ants couldn't climb. Maybe a garden supply store has something that would work better than soap?
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3.6 L. getula californiae - 19 eggs (Cal. King)
1.1 L. getula nigrita (MBK)
1.0 Pantherophis guttatus guttatus (Corn)
0.1 Pituophis catenifer catenifer (Pacific gopher)
3.3 Elgaria multicarinata multicarinata (Cal. Alligator Lizard)