This is a bit of a delicate topic, but in the past I've worked in an office with 8 people on one floor with one bathroom with no fan, and learned quite a bit about the best ways to eliminate bathroom odors. After all, everyone likes the person in the office who is able to get rid of the bathroom smells.

The most simple way to eliminate unwanted odors, and the method used by most fraternities, is to light a match. Something about the lighting and the flame will burn up all unwanted bathroom odors. But you have to use at match. It's been my experience that a lighter does not work nearly as well.

While an air-freshener spray can mask some smells, I don't think they work nearly as well. Here's an old joke about them:

A door to door salesman selling pine scented air freshener rang a woman's doorbell. As he waited, the prior night's beans caught up with him and he farted. Thinking quickly, he sprayed the air with the pine air-freshener just as she opened the door. He then ask, "Hello Mam, what do you smell?" to which she replied, "It smells like a bear took a crap in a pine forest."

Scented candles are great! The only risk is that if you leave the bathroom and leave the candle lit, you run a higher risk of fire. So if you're going to use a candle, make sure it's in a cup/casing that will contain the flame, and that nothing close to it in the bathroom is flammable. Don't put it just below the towels. You have the additional benefit of lighting a match to light the candle. Double whammy!

Plug in air fresheners in a bathroom are the equivalent of taking a knife to a gun fit. Enough said.

If you have a fan, or can easily install on that blows the exhaust outside, that can work extremely well in conjunction with a match. But if you're considering installing a fan, make sure it doesn't just circulate the air into another part of the office or house.

If working in a confined space with a burrito loving office wasn't credentials enough, I had 10 inches of my large intestine removed in 2001 as part of my surgery to remove a colon cancer tumor. Between that an 6 months of chemotherapy, one might say I had my "muffler" removed. It took a few months of eating yogurt and taking probiotoics to replace the good bacteria in my intestines to get everything back to normal. During that time I had what my friends called special powers. Lets just say that you didn't want to upset me if you were in a car with me and I controlled the windows. Fortunately everything is back to normal now.

If you know you're a likely offender, or know you do want to offend someone elses sensibilities, I recommend carrying matches. Everyone will appreciate it. Alternatively, plan in advance. Use the rest room at a restaurant, on a different floor, in a gas station, or somewhere other than a poorly ventilated bathroom near others.