i've been there with my boy rod. although not as constant. rod's has seasonal allergies. his ears get real bad sometimes and he always chews his paws. here are some of the things i do.
-first off i switched his food to wellness fish & sweet potato. thats my latest solution. i've seen a dramatic improvement in his itchiness
-i have a solution that breaks down all the grime. i squirt it in his ear and massage it in good. then get a cotton suabe (sp?) and wipe it out. i also use a q-tip or 4. but be carefull not to dig with them it pushes the crap down more. i use them to get that excess crap out that gets stuck in there.
you could even douse the cotton ball with the solution and wipe away.
-i also use benedryl for him too. or a generic brand baught in bulk is a good idea.
-after i cleaned out his ear real good, i'd squirt a bunch of cordizone cream in there to help numb the pain.
-also the vet prescibed me with some oinment to squirt in there too. but i found the cortizone stuff to work better.
-antiobiotics are always good too.
which you probably know.
as far as reoccurring ear infections its usually a good sign of food allergies. if your pup has it yr round than i would look into food allergy stuff.
theres nothing worse than seeing your pup mutilating itself, i know that for sure. the constant head shaking is a bitch too.