To quickly and easily remove all unwanted comments when using Sublime text, perform a search and replace (CMD, ALT & D) and enter the following. Make sure that regex search is enabled by clicking the small icon in the bottom left that looks like an astrix.
For example, to remove all HTML comments:
(?s)<!--.*?-->
search and replace with blank
Or to remove all CSS comments:
(?s)\/\*.*?\*\/
Bonus: How to delete blank/empty lines?
^\n
Thanks!!! Here's a minor tweak to remove all HTML comments and the trailing newline/return, if it exists: