How to clean mud off of these Nike shoes?

My boyfriend got these awesome limited edition golf shoes for Christmas. We went golfing yesterday and we never could have expected the amount of mud there was everywhere. Safe to say that his shoes are completely covered in mud now. He’s very sad about it so I thought I’d surprise him by cleaning them to look brand new again. I’ve never cleaned nice shoes like this so I don’t want to ruin them. Any tips?