Clean TG Client supports keyword blocking for third-party chats.

admin

First download Nnngram from the official channel.
https://t.me/Nnngram

Then log in to your account and go to settings, Nnngram - Chat - Message Filters

Message filters use regular expressions, formatted as: aaa|bbb|ccc|ddd|eee
aaa, bbb etc are keywords you want to block.
Input them carefully, congratulations! You now have a clean version of Telegram!