May 2011 (Update)
Just a quick update this time...
This is what happens when driveshafts let go (or the CV boots split) and grease gets caked and baked onto your alloys. What a mess!
However, the first problem I encountered was getting the wheels off the car. The muppets at the local tyre place had put them (the nuts) on WAY too tight and consequently I could not move them, not even with a longer bar. In fact I ended up breaking the jack and bar that comes with the car as standard as they weren't able to withstand the forces applied. A quick trip to the aforementioned tyre place and they were loosened before being tighthened back up to 105nm as per Renault's guidelines.
Back at home I was finally able to get the wheels off for cleaning.
As you can see below, it was not just a case of a few grease spots here and there. There was a thick layer of grease around the whole inside of the alloy.
A quick rinse down was certainly not going to be enough to remove any of the grease. I tried it and was proved right.
Wonder Wheels would not even begin to touch it (which I used carefully due to it's somewhat acidic nature). So, I tried a small sample of Meg's Super Degreaser and let it dwell for a while. Even this did not remove much of the grease.
Large grease deposits were still evident as can clearly be seen in the photos.
In the end I resorted to grabbing a few pairs of latex gloves and literally spent a few hours removing the grease by hand; carefully using my fingers to scoop away the worst of the gunk. After a while things started to look a little better and the Super Degreaser began to work much more effectively (which reminds me, I must get some more).
After a lot of elbow grease (no pun intended) I treated the alloys to a final thorough clean and rinse before applying a liberal amount of wax/sealant to protect them. Considering the state they were in, and the abuse they've taken recently, they came up quite well.
Finally, the wheels were put back onto the car and her shoes were looking a bit cleaner than before the ordeal!
Cheers!