To the OP:
If by "in ear monitors" you really, truly mean in ear monitors, like Etymotic ER4S's, then from personal experience I would say it's very easy and very effective to simply apply a thin layer of olive oil to the rubber flanges before insertion. Not only will it help you to get a better seal and better sound accuracy, but it'll lube-up your ear canal so as to coax any earwax buildup gradually towards the outter ear. After following the above procedure myself, it's not unusual for a big lump of wax to just roll right out of my ear - like Stimpy's brain out of his, if you ever saw that episode
If you mean iPod-style ear-buds, though, then you're on your own - until you buy some serious ear/headphones, anyway.