Help please?!

I have a cartilage piercing near the top of my ear. In got in done in like grade 8 and in in grade 11 now. The who pierced it pierced it with a gun (yes that's fucked I know) but I was wondering since the hole didn't close up and I've recently put a gold earring through what are some ways to stop it getting infected besides ear spray stuff? I've tried to put it in before but it generally bubbles so I was wondering what ways there are of keeping it clean? Cause I don't know many