Php html cleaner

I don't know of any functions that do it, but on our system we do some of this code cleanup just using regular php code to find it:

str_replace(' align=left', '', $content);

You have to be careful and thoughtful about what things you want to automatically fix, to make sure you don't cause unexpected and unwanted changes as a result, but there are lots of little things like this that can be replaced and fixed on save.