Charcoal: Charcoal is on the top of the list of smell deodorizers as it is one of the best absorbent agents that can soak up the bad odor. Charcoal is also widely used as water filters and in most odor-removing commercial products. You can put a medium-sized chunk of charcoal inside your smelly patio for instance, and leave it there for a couple of days. You will notice that it can effectively remove the trash can smell.
Trash Can Smell Masking : If you can't beat them, hide them; that's the whole idea behind perfumes and some such products, isn't it? The methods below basically mask the smell with another more powerful odor rather than remove the smell, so you should be sure you are going to be happy with the result.