Poor Pads - Bella used to get ear infections all the time as well, we were forever having to pin the poor thing down, put cleaner down and then drops, she hated it, I ended up like a walking doggie chemist the amount of things we tried.
Slightly off topic but it's partly why we switched her to a raw diet - she's been on it since October last year and (touch wood) hasn't had a single ear infection since then - she was on Burns before so it was hypoallergenic etc but she just had smelly, infected, mucky ears all the time. I tried Thornits but it unfortunately didn't seem to do the trick.
These days I rarely even need to clean her ears, I still check them regularly but they smell fine and are really nice and clean. She also used to get lots of eye infections and those have stopped since the raw diet as well.