I can relate with you about ear problems. My lop has had infections for the last year. About 5 or 6 of them. He gets severe wax/pus buildup. I would do as the others suggest and discuss it with your vet first. When I bring my mini-lop to the vet with an infection and build up my vet sometimes flushes his ears with saline and a big syringe that can be put deep in his canal. It usually brings up a lot of stuff.
At home, I clean his ears twice a week with a solution given to me by my vet. It’s called MalAcetic Otic. I fill his ears with the solution, pop a cotton ball in there and thouroughly massage the base of his ears and then wipe it out with another cotton ball. It works pretty well but when he gets a severe build up (which happens occasionally and I assume blocks off his hearing almost completely), I use an ear tool I bought over the internet. It’s made for people and is like a little spoon with an LED light on it, I can go in the canal and dig up the stuff. It’s imperative to be EXTREMELY careful with this tool because the ears are so sensitive and they can bleed if you are too rough. I would also never use this on a bunny who is not likely to sit perfectly still or with a sore-eared rabbit because it might be very uncomftorable for him.
It’s important to keep lops ears clean because if there is a large buildup of wax and debris it’s breeding ground for infections.