How to use the Drive Cleaner
Although Drive Cleaner uses really clever scan mechanisms, it still is easy to use. If you want to use the (secure and for most users also the appropriate) default settings, just click on Search (see arrow) and let the Drive Cleaner do the work.
After the search is finished you have got time to have a look at the results. Here you can also organize the results according to their origin. Just click on a category on the left, for example Temporary files or Adobe Reader (see picture below).
The found files are automatically checked, so (after you made sure that these files can be deleted) you can just have to click on Delete. Then the files are deleted. If you would like to delete only single files, you should click on Select None first and then select single files and click on Delete.
If you uncheck the box in front of a file, it will not be deleted.