This plugin is outdated and might not be supported anymore
WP Clean Characters

WP Clean Characters

Details
View on WordPress

Copying and pasting content from the web or other documents can insert invalid characters into post content and create invalid RSS feeds. WP Clean Characters fixes this by converting those invalid characters into valid UTF-8 entities when saving a post. A feature is also included to go through your post archive and clean any invalid characters in those as well.

Details

Plugin code:
wp-clean-characters
Plugin version:
0.1.0
Outdated:
Yes
WP version:
2.9 or higher
PHP version:
or higher
Test up to WP version:
3.0.
Total installations:
10
Last updated:
2014-04-17
Rating:
Times rated:
0
entities
html
utf-8
valid