[Phlogiston]

You can wipe off the fish-eyed toner with lacquer thinner. This may also help with some of the contamination, but, probably not. The silicones and oils sink deep into the wood. Even sanding will not get rid of them. Dry coats. I have found the canned toner to be very soft even when dry. It would probably be more productive to lightly sand in between top coats, which you will also have to put on very dry. If you are using a semi-gloss, you might not have to buff it out.