Put vinegar and baking soda in your drains periodically. It keeps them clear.
This isnt' completely green but it is far better than the commercial products on the market. Make a paste of bleach and baking soda and put it on moldy grout. Let it sit awhile and wipe it off. Most if not all the mold will be gone.
To get onion smell off your hands, use a piece of silverware like soap and wash your hands under the faucet. The onion essence leaches to the silver and voila! your hands are scentfree.