Good Morning Don and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
It appears that Prince is suffering from some form of allergic reaction and the treatment you are giving is not enough. Prince needs to also be given an anti histamine such as Benadryl or Diphenhydramine at 1 mg per pound every 12 hrs. This can be purchased at the chemist, Don, in pills or liquid and when added to this concoction you are giving, will decrease this congestion and decrease the mucous being formed.
If this is not enough, Don, your vet may have stronger medications to help Prince past this...don't give up hope yet, Don....we can get sweet Prince past this.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please REPLY so I can clarify for you.
Sincerely, XXXXX XXXXX
Thank you so much,Don, for your kind rating. It is very much appreciated! Even though you have rated, we can still communicate. If you have other questions, please Reply. I am always happy to help.
Have a wonderful day!