Outside.
I use water and vineagar mixture, warm, squirted into the ear from a dish detergent type bottle. Hold the ear flap down, massage the skin around the bottom and back of ear for a minute, then let him shake it out. Do this two or three times for each ear depending on how dirty they are.


Max

 

If the ear is not infected, what I do is use a very fine cloth, like a baby's washcloth, wet it and wring it out thoroughly. I wrap it around my pinky finger, insert it very gently and sort of work my way down as far as is comfortable for the dog, and then gently wipe it around in the nooks and crannies. I usually do this when I'm giving them a bath or they've been swimming, as some water has gotten into their ears no matter how hard I try to keep it out. It keeps their ears quite nice. If there is an ear infection, I do a more complete rinsing with vinegar/water or a commercial ear preparation, or medicine from the vet.

 

Here's a good article with a video from Petguide.com on how to clean a dog's ears. I use this method of soaking a cotton ball with the cleanser.

6 Ways To Properly Clean Dog Ears - PetGuide

I use Virbac Epi Optic Ear Cleanser, I got it from my Vet Clinic, it has a drying agent in it. Not sure if you're able to get in there in India.

Virbac-
Virbac Animal Health — EPI-OTIC® Ear Cleanser | United States