Frizzy Bellami clip in hair extensions

Hi all, I’ve been hearing conflicting things on how to take care of clip in extensions. My wedding is in a few days and I’m trying to see how I can treat my extensions which have been getting very frizzy and not holding a curl. Some sources say to use only gentle shampoo and air dry them whereas some YouTube videos I’ve seen say to use several anti frizz products etc. I bought a new set of extensions in case the others are too damaged and haven’t washed them yet so looking for all advice. Please and thank you!