I've noticed something in my front shocks and I'm not sure if its new or normal. When I compress the shocks by rolling it forward and pulling in the front brake, it feels like there is some slight resistence at first. It's subtle and there is no leaks. I ride in the sand a lot and I don't want to damage anything. Is it fairly straight forward cleaning and rebuilding them? How can I check to see if there is anything wrong with them?