Easy solution

It's definitely more fun changing to summertyres than the opposite. But it is so annoying when a wheel has decided to not let loose and want to stay together with the car in a corroded relationship. You can use a lot of effort and bad words when trying to persuade it to loosen its grip. But the best way is to use a tool that is big enough. One knock will do the trick :-)

In some way you can make it like a saying: Don't do unnecessarily work, use a larger sledgehammer.