Soaking your feet in hot water that is comfortable to your skin but not too hot can help to get rid of corns.
Soak the feet in the hot water for 15 minutes and the hot water will help to soften the corn to make it easier to remove.
You might also add some epsom salt if you want too. Once the corn has softened take a skin file or a pumice stone to sand the corn gently.
It may take a few treatments of soaking your feet and sanding the corns on your feet to get them to fully go away.