The best way is the installer that came with the software. If it has an de-installer in the same install app. If not, then try one of these.
Or you can try Spotlight, which you might use to track down any other files not deleted.
Also of note: Some recent talk again about virus software for the Mac. I don't recommend any of it; if you absolutely need something, try "ClamXav" It's shareware. I use only ClamXav and never have any file problems; except an occasional mail file, which is usually a windows attachment. Which is benign to Mac's anyway, that is if it is even a virus?
Most important is a firewall setup that is already in the Operating software, which I have discussed in previous posts. Jon L
PS: you can find all these apps here. Versiontracker