My DS2 had recurring ear infections and alot of wax would also accumulate in his ear. I didn't put anything in.. I have heard olive oil can work.
In the end I got a referral for an E and T and he had some special little tool and scooped the wax out..it literally fell out of his ear with the tool he used.
If there is alot of wax inside..they would not be able to see the ear drum to check for an infection or glue ear. This is what prompted me in the end to go the E & T.
HTH