Update on project - all 10 of my windows have a permanent fog. (well only 7 now). My MO is to cut the spacer at one corner with my saber saw (verrrry carefully) cut about a 2-3 inch slot down the middle of the spacer. That allows the glass in the corner to flex, .002". Just enough for my box cutter to get in and slice 3 sides loose (takes about 5 min), then stand the glass up and cut the 4th side loose. For the other pane a pair of pliers twisting the spacer up & my box cutter and the other side is done in 1 min. I've found my wood chisel does a good job of cleaning the old sealant off. And I've decided 90% clean is just fine because it's going to be covered with new spacer & sealant. I then use Stove Top Glass Cleaner (yes dear I will buy you a new bottle...) and go over all 4 surfaces with my 3/8 drill with buffing pad - med speed, then Windex and a microfiber shop rag.
If you watch the SuperSpacer video (above) I recreated the applicator tool from a 3" piece of 1x2. It applies the spacer about 1/8" from the edge of the glass - very neatly if I do say so myself
I have noticed that the finished product is not as "fine" as "factory new" but then you have to get within 3" of the window to see the flake of something that got in as it was getting closed up - but then what's that word??? anal??? Film at 11.