I have to withdraw what I said about Eyelead gel stick. It works perfectly, it was me using it incorrectly!
The stick comes with special sticky paper to clean the gel. It is a piece of thick glossy paper covered with much thinner peel-off paper. Instructions simply say "use the sticky paper to clean the gel". And I used the thick glossy paper. It turns I was wrong! It is the thinner peel-off that is really sticky and removes all the muck from the gel easily. After this treatment the gel regained its dust collecting power and cleaned my sensor perfectly!
By the way, I just had a bad experience with wet swabs. I bought Eclipse cleaning liquid and wanted to get recommended Photographic Solutions Sensor Swabs. However, when I was ordering, they were unavailable in the UK, so I went for a cheaper alternative (made in the UK). Usually I'm not so keen on "cheaper alternatives", but these had really good reviews on Amazon.
Well, I followed instructions (two drops of liquid on the swab) and ended up with the sensor covered with filth. Not only smudges of the liquid, but also lots of lint from the swab itself. I was horrified! I used another swab, with one drop only, which helped slightly, but left my sensor quite dirty anyway. So, I came back to my Eyelead stick and carefully and patiently removed all the muck, little by little (using the correct side of the sticky paper). Eventually got a very clean sensor.
The moral from my adventure is:
- Eyelead gel stick works very well (if you do it properly)
- Cheap sensor swabs are crap
- Wet cleaning is tricky!
As a result, I'd recommend the gel stick.