Hi there and thank you for your question. I am a licensed veterinarian and would be happy to assist you. Without an exam, you can't tell if the ear drum is ruptured, so there aren't many over the counter treatments that would be safe. You can, however, use this ear cleaner, which is safe for possibly ruptured ear drums:
You can use it once daily on the ears and it will dissolve and break down the wax and help get the infection out of the ear. Some people recommend betadine mixed 1/3 betadine and 2/3 water to flush into the ears to clear the infection, but that can be dangerous if the ear drum is ruptured, so I would not recommend that. Try the Cerumene cleaner and see if that helps. Hope this helps! Best of luck.