Hey pemihan,
Yes, the eclipse I used was fresh, actually bought a kit from teamworkphoto which had those presoaked pads. Used one of them with the white card from phase. The dust on the surface was wiped properly, but I did see some dust in the photos, and after looking with a magnified lamp, saw some dust specs which appear to be under the IR filter.
Also, after wiping the sensor, I did get some dried blue solution from the bottom edge (that was probably solution B from phase), most likely from a previous clean.
Probably the previous owner cleaned it with eclipse/phase solutions which weren't so fresh. Anyway, thanks for giving your input. Really appreciate all the help from this community.
Cheers,
Mircea