Can we use the program Adwatcher on our ads? My invalid click rate has skyrocketed and I would like to instead of blocking the cities, instead block the IP Addresses. Plus if a warning sign pops up for these 'clickers' maybe it would slow them down.
You can use adwatcher on your ads but some times tool like adwatcher don't know what invalid clicks are. I recommend to analyze it by yourself. You can refer these articles for more information -
if you still suspect then you can report about them with your finding here - http://www.google.com/ads/adtrafficquality/advertisers/click-investigation-request.html
Hope this helps,