Isopropyl Alcohol (IPA) in a very high concentration (>90%, if possible ~99%) will actually do the trick. I was already suspicious that it could work since I accidentally caused some (unimportant) adhesive patches on a 13'' Unibody MBP (which had suffered a massive wine spill) to peel off after I submerged its parts in that stuff (guess what, the MBP worked fine afterwards! ;) ). So, *even if you're just taking out the battery to repair the trackpad*, you can safely remove the battery without causing it any damage. Check out this video for details on the procedure: http://www.youtube.com/watch?v=pLhHSIej9...
Well, Peter, you're not stupid because you'd risk voiding the warranty otherwise. However, Erich is not entirely right; creating a logical volume (a.k.a. Fusion Drive) in Terminal is fairly trivial (just make sure you create a USB OS X installer with DiskMaker X before popping open and screwing around with your Mini's innards and you'll be fine), and activating TRIM support is only a freeware download away (the TRIM enabling portion of TRIM Enabler is, thankfully, free). I've installed and configured such a setup on my 2009 27'' iMac, on many MacBooks and even on a 2012 Mini, and they have all been running just fine!
Have you noticed that cool newt logo on the logic board? I've never seen or read about it, it seems you just uncovered an easter egg! ;)
Is it just me, or this is an OS/2 system? Cool! ;)