Professional cleanings I knew, but I am always shied away in the face of prices between 30 and 50. Therefore, I looked for DIY kits. After much research I decided for this set.
The result is convincing. I've done three drops of the liquid on a swab and allow a few times wiped across the sensor. Then made as written above a test image - which saw already worlds better than before, but two spots were still there. Then two more times over purposefully wipe with the same swap at this point (Note: mirrored!) And even made a test image: Perfect! The test picture is now a single white space.
With the width of the Swabs I had no problems with my Nikon D7000. It is slightly wider than the sensor surface, but is good as well as around the surface is still a small frame of about 1 mm on each side.
The tin looks classy and protects Swabs well - being on the go but also a bit clunky. A mini can for only a Swab with Flüssogkeit I would have preferred.
A star deduction's only because of the price - 30 for a couple of plastic rods with plastic tip and 5 ml of fluid is already steep. However Eyelead here is still the lesser evil, because the competition is expected to be even more expensive per application (VisibleDust = 20 for 4 Swabs with 1 ml of detergent). And cleaning the expert anyway. To that extent, this is still the cheapest way to reliably get its sensor clean.
The Swab used looks incidentally still completely Auber from - I think you can use it again also.