I just got my first bike about a month ago and I am going to do my first chain adjustment today. It's a 2004 ninja 250. I was wondering is it bad to use soap and water to clean the chain. I've heard things about kerosene and Wd40 but both have cons about them cuz they can actually wear down the metal or something like that. Anyway, what is my best bet to cleaning it. I've also noticed the last time I was messing with the bike, I had it on the center stand and the rear wheel wouldn't move on its own. Why is this?