Vinegar works pretty dang well on cleaning the grout in your bathroom.
I've been in the process of cleaning my shower about once a week, just to make the project a little more manageable. My shower grout may be the only thing that will prevent me from getting my full security deposit back, which is something I'm trying really hard to get. I had to pay a lot for my security deposit -- the equivalent of a month's rent, to be exact. I hadn't rented before, not even in college, so I had to pay a little extra to show that I was trust-worthy. The new place had a pretty strict screening process, so the security deposit is really cheap. Especially for 2 people. So I'm really trying hard to get all of that money back.
I had never used vinegar for hardcore cleaning before. I mean, I've always used it for washing floors because that's what my mom does. But I guess I never put much thought in it. For the bathroom, I usually use one product for mostly everything: Scrubbing Bubbles. Good stuff. But it just wasn't getting the job done in the shower. It fought back the mildew, but didn't quite defeat it. I figured there must be a better solution. So I Googled it.
After 30 minutes of reading through home remedies (I didn't want to drop any dunkets on some expensive cleaning product), one woman swore by using vinegar. Plus, she said, it's natural so you're not dumping a bunch of chemicals down the drain. Sounded legit to me.
Holy crap. I'm not even kidding. It works so unbelievably well! I poured about 2 inches of white vinegar into a juice glass, grabbed my 99 cent Walgreens toothbrush I use specifically for cleaning, and went to town. That mildew just melted away. It was way less work than the cleaning products!
Seriously. Go into your kitchen right now. Grab some vinegar. Bring it into the bathroom. Grab an old toothbrush or sponge or something like that. Dip it in the vinegar and try it out. It's great. I promise.