You could take a look at Sarah Jeffery’s video on this subject:
The only thing about it I don’t like is that she doesn’t point out that the only way to temporarily get rid of the clogging WHILE PLAYING is by sucking. She makes it sound as though they are equivalent methods and use the one you like best. I find that blowing is more effective when it gets very clogged, but, as I said, sucking is the only practical way to do it while playing. You can see players doing it when there’s a moment where they aren’t playing.