When using the free version of Lavasoft Ad-Aware, be sure to update regularly. My “ignore” list was growing and I wasn’t adding to it! Once I updated and rescanned I was able to remove tracking cookies that I couldn’t before the update.
I also found that when scanning during the day it would often get “stuck”. I don’t have that problem when I start a scan before I go to bed (usually around midnight).
I have been very happy with the free version. If I had the funds available I would pay for an upgrade with scheduled scanning.