That did it, and I found the Macromedia folder….but nothing it it that would indicate trumpgolfscotland.
V1's referenced path was /Users/ryck/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys/
In my installation, that folder contains a file named settings.sol, which stores your Flash prefs (as set in your pref pane in System Prefs).
If you've got anything else in that folder, delete it; if not take a look in settings.sol and see if anything looks off.
My recollection is that the type of cookies we're talking about can be stored in an assortment of different locations, so if you've actually got one it may not be where you're looking.
Have you tried searching for trumpgolfscotland, either as a separate file or as contents?