Encode/Decode Online Tool
http://urldecoder.waraxe.us
Strip Unwanted Query String
https://sites.google.com/site/onlyvalidation/page/strip-unwanted-query-string-apache
RewriteCond %{QUERY_STRING} (^|&)doing_wp_cron= [NC,OR]
RewriteCond %{QUERY_STRING} (^|&)refsite= [NC]
RewriteRule (.*) /$1? [R=301,L]
Blacklist via Request URI - Did NOT Work
http://perishablepress.com/eight-ways-to-blacklist-with-apaches-mod_rewrite/
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^.*(,|;|:|<|>|">|"<|/|\\\.\.\\).* [NC,OR]
RewriteCond %{REQUEST_URI} ^.*(\=|\@|\[|\]|\^|\`|\{|\}|\~).* [NC,OR]
RewriteCond %{REQUEST_URI} ^.*(\'|%0A|%0D|%27|%3C|%3E|%00).* [NC]
RewriteRule ^(.*)$ - [F,L]
</IfModule>