I cleaned my sensor successfully, as I have been doing for many years. I always do my test shots at f/22 or smaller apertures to see the dust spots. I had thought that we stopped down to increase the depth of field to see the dust, but a few years ago I was told, probably on these forums, that DOF was not a factor, but there was a different reason for stopping down.
I have completely forgotten what the reason was, and would appreciate if somebody could remind me.
By the way, I have given up on saying I am having a "senior moment." They come so often now that I only mention the lucid moments