Dirty Ears

I bought some small animal ear cleaner at the pet store the other day and used it on my piggies today, and I was shocked by how dirty their ears were! Could this be normal since I have had them for so long and didn't realize I was supposed to clean their ears, or do you think something is wrong? Also just a quick update, all three pigs are getting along wonderfully now in their new C&C cage! Although I wouldn't say that Hope and Jesper are the best of friends quite yet, all three of them always seem to be hanging out right next to each other. Also, it has been a little over a week since their first Revolution treatment, and when I brushed them today I noticed there was hardly any dandruff and a lot less shedding!