[stoppingdown]

Curiously, in the past two months I've been forced to clean my sensors more than in the past fifteen years... I got visible spots in many photos (fortunately, never on difficult areas and I could clean them in post-processing). The last time I cleaned the sensor a similar phenomenon happened, but not completely the same as yours: looking at the sensor after the liquid dried up, I could see some tiny spots. But they weren't sticky: it seemed they changed position after another cleaning round. So in my case, it seems that the liquid didn't dried up properly. Fortunately, the thing doesn't have consequences (f/22 at the sky is ok).