If Rubys ears are grubby i give them a clean with a baby wipe and keep the hair short,but i must admit sometimes they can be "slightly"whiffy when i have a sniff
I have used Thornits in the past but it seemed to irritate her,i can't remember,do you put it down the ear hole or sprinkle just around the outer part
I haven't used any ear cleaning solutions
but Ruby has never had an ear infection.
When she did have a dart removed earlier in the year though the vet said she had a waxy ear,but that did stop the dart going down any further and doing real damage.
Maybe i should use something,it will be interesting to see what other people do.