I can't give you a better place right now, because i have not files at this Computer, but I can give you a lead.
I advise you to look in the chat command area /removebuff, you can try to find the answer to your question there
P.S. note the vulnerability associated with this command. After using this command (at least it was on my old server), if you have activated Pets (for example, a rabbit, a tiger, a lion), then your bonuses will become 2 times more (stat hack). So don't forget to fix it if you take my advice.