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!
Is it just me, or this is an OS/2 system? Cool! ;)
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! ;)