Do you need a cheap and effective general deodorizer for stinky gym shoes, the smell of a wet dog or even less than flower fresh armpits? Baking soda is the answer as it helps neutralize odors.
Sprinkle it liberally on the source of the unpleasant smell.
If you have run out of deodorant you can use baking soda mixed with cornstarch. Be careful not to inhale it as it may cause problems to some people.