[Kia]

1. Do not use "return 0" etc. use the provided values like PLUGIN_HANDLED
2. task_clean_chat() is an infinite loop.
3. Instead of going through each player, simply use 0 as parameter for the player.
4. You can still see what was written in the console. Therefore it is impossible to really "clean" the chat.
5. You can use Anti-Spam Plugins to prevent Spam / Advertisment to be written very well.