Explanation:

After going to the toilet, you just need to light a match and drop it immediately into the toilet.

The reason for doing this is because the process of going to the toilet will produce a gas called methyl mercaptan. This gas will bring an unpleasant feeling, pollute the air and leave a lingering odor. The match contains sulfur, when burned, it will create sulfur dioxide gas that immediately overwhelms the smell of methyl mercaptan, thereby helping to eliminate the odor extremely effectively. This method is especially suitable for toilets that are not well-ventilated, with little air circulation to the outside. Not only is it extremely effective, the match trick will also be much less expensive than using deodorant spray.