Clean-up Code Software

So I've been having problems with HTML code and WYSIWYG. When I use the one that starts with W, it puts a lot of superfluous code into the text version and messes it all up. Very untidy.

There should be some sort of software (like the spelling on that's my comp...what is that?) that allows the user to put code through and highlight the code that doesn't need to be there, i.e. it won't affect the look and functionality of the page (essentially the page itself) so you can delete it.

Someone please create that!