The above screen shot from Audacity shows the same song three times. The top most version is before cleaning. The middle version is after cleaning. The bottom version is after click and pop removal. You can see at approximately 1:10 a clear example where cleaning removed detritus from the surface of the album. A less obvious example is at approximately 1:56. The second example is at least as important as the more clear example at 1:10. You can see the effect of click removal clearly at approximately 0:52 seconds. Click removal is even more dramatic when you hear sound samples 2 and 3 below.