@Katelyn22 I have no bear-specific advice, but you win the award for the day's most amusing post title!
A lot of remote hosts have trouble getting guests to adhere to trash removal policies, especially those that involve taking it to another location. Perhaps the possibility of confronting a bear would be a good motivator to follow the instructions. But as a general rule, the simplest and easiest-to-follow method has the highest chance of success. If you can't be there to manage the waste removal yourself - or if this service is beyond your pay grade, so to speak - I think letting guests use a designated portion of your garage would be the way to go.