The garbage usually shows the things we are trying to get rid of such as unnecessary people or situations you are sick of. The garbage could also indicate the things that happened before and are no longer important to you. If you see lots of the garbage it may be a suggestion to change your views about something, maybe because you think better about yourself then the others. When you dispose the garbage of the others, then it means you will help those people to clear their minds or even solve some situation.
Read more about dreaming of Garbage in other dream meanings interpretations.