I put 5 drops into my little Maltipoo's eye.

I use FOUR PAWS EAR POWDER it is medicated to help kill critters, keep the ear dry and makes it easy to pull out the hair that has to be removed. Not sure if they have it here but I'm pretty sure they do, if not you can find it at a local store. The R-7 is a liquid and so probably not the thing you want (the powder makes the hair easier to pull out because it adheres to the oil and wax in the hair) as ultimately this is a cleaner and not for numbing or removal.

Check to see if there is dark brown stuff in the cat's ears (like wax but especially hard to clean out). That is one of the biggest indicators of ear mites, also if he scratches his ears a lot or hates when you get near/clean his ears. It is probably really dangerous to use something on an animal when you aren't sure what the problem is! You should look up low-cost animal hospitals/shelters where they provide treatments for people with low income.

you have to use the cleaner first and then you use the step two ear mite and tick cleaner.