Help on repairing my dads old 1972 Ebbtide

Whats up guys. I'm new to the forums and the world of boating. My first project is going to be my dads first bass boat. The major thing I need to work on is the gel coat on the boat. As you can see it looks like there is residue all over the brown flake. This is because he said that years ago he bought VC Glaze, I think, and it make the boat look great! However, he was never told and didn't know 2 years later it would look like that. I was wondering if anyone had any tips on the best way to go about removing it and restoring the boat to its proper look. I do understand it will never look like new but i would like it to look like a respectable bass boat. Thanks for the advice in advance and I look forward to learning all I can.