I fully endorse the use of Crap Cleaner from the link above. HOWEVER be aware that it will delete all cookies unless you save them first. Before using it for the first time, open the program with a double click. Then click on OPTIONS followed by a click on COOKIES. Cookies from websites where you need to log in such as PCA, should be dragged and dropped from the left window into the right window. This will save them from being deleted in future. If you follow this link, there is an excellent guide on Crap Cleaner. I repeat this is an excellent program, and I run it every day, it takes about thirty seconds.
Crap Cleaner is perfectly safe, and will not remove anything which it should not. Much of what it removes is rubbish left over after being on line. I have not heard any report of problems with this program.