You can use vinegar in most bathroom steam cleaners. ' Vinegar coupled with the hot steam makes for the ultimate cleaning duo. However, I’d advise you to be careful with that because there are some steamers that you shouldn’t experiment with. Besides that, hardwood floors can get damaged by vinegar.  Instead of using vinegar, you can get a steam cleaner that comes with cleaning solutions like the Bissell SpinWave I’ve mentioned above.