Hello. I am having a trouble with my mac. I think it feels bit slower than before. I want to manually clean my mac, but I don't really trust any 'cleaner' applications. I think I have a lot of temp files from making videos in the past and chrome in general. I have all the hidden files viewable and I still can't find any junk to delete and afraid to mess with it.

1. How do I clean my browser(chrome)?
2. What possible cause can It make my computer run slower?
Just to let you know. I deleted all of my chrome extensions, including ghostery and theme changers and re-downloaded Adblock, but it doesn't really help at all.

Any suggestions or thoughts?