I'm not even sure degunk is a word but if you've got a PC that's 'gunked', you know what this means. The good people over at tech publisher O'Reilly have a great little 12-step program set up to degunk your Windows-based PC.
Top 12 Ways to Degunk Your PC by Joli Ballew — Your PC, with its 80GB hard drive and 512MB of RAM, runs way too slow. Why? It's gunked up with pictures, movies, music, and attachments you've saved; you've saved stuff to the wrong places; and you have apps installed that you don't use. If you want to clean up your PC, and get it running as fast as it should, follow Joli Ballew and Jeff Duntemann's 12-step program for degunking your PC. Joli and Jeff are the authors of the bestselling Degunking Windows book, from Paraglyph Press.