You did a really good job. I have never been able to clean my sensor very well except when using wet swabs. When I use a blower, it removes some dust but mostly seems to just move it around. At a Nikonians workshop a few years ago, I saw a sensor brush demonstrated, and it worked very well. However, when I got one and tried using it myself, I almost immediately got it contaminated with oil or grease when I inserted it into the camera. I have stuck with wet swabs ever since.