More: Years ago, I tried to follow app installations with fseventer to see precisely what was happening, but it was beyond me.
Synium Software's
CleanApp ($14.99) does that for you so you don't have to. Additionally it keeps track of what supporting files and folders are deleted by other users as a guide to your deletion. I have relied on it for several years and it hasn't steered me wrong yet.
DISCLAIMER: I receive no remuneration from Synium Software other than that of being a satisfied purchaser and user of CleanApp and several of their other apps.