WILSON ORIGINAL SOPHIA'S

I've used Goo Gone and Denatured Alcohol (ethanol), with a plastic scraper (do not use metal). The process is very easy. To avoid getting any of the cleaning solvent on the driver(s), elevate one side with something like a towel, and only clean the glue off from the bottom half so the solvent cannot run into the driver (damaging the foam surround). Obviously, repeat the process working around each driver. On my first attempt, I taped around the drivers trying to protect them (and without elevating one side of the speaker), and it didn't really work that well. If you're careful, and you tilt the speaker (always working on the bottom side of the driver), you shouldn't have any issues. Make sure the speakers are absolutely clean before applying the pads (don't be in a rush).

@golfnutz is correct. Just have to take your time, use no metal tools. When you need a break, take a break. Its not a fast easy process. 

An easier way that completely avoids damage to the drivers is simply remove them. The only caveat there is if the leads are soldered. Not sure if they are or not on the Sofias. Doubt it. It will make the process much simpler and less likely for an expensive oops moment.

I haven't opened a pair of Sofias but I have worked on other Wilson where the driver terminals are soldered. The leads can be quite short and substantial, so desoldering/resoldering the drive units is not a trivial task. It needs a powerful iron and care not to put too much heat into the drive unit. It's a two person job to do it properly.

You could unscrew the drivers and pull them out somewhat without the need to de-solder. You’d have to have something to support them while being elevated from the enclosure. Personally, I really don’t think it’s necessary. As a precaution, you could apply painter’s tape on the inside of where the driver is recessed making a circular wall to help keep any solvent from dropping down. You should still use the method I described earlier to totally avoid any issues.

You created another thread about changing resistors. For peace of mind, you could replace what’s in them currently (so you have a baseline of how old they are), but a strong recommendation NOT to start rolling various resistors thinking they might increase sound quality - total waste of money! This should only be done as a last resort due to room integration issues with this speakers. WA has spent countless hours optimizing the best resistors for you already. I say this from my own personal experience (hint - the sound only ever got worse).