Any cleaning products that are made for cleaning guns should work just fine. As to the sights, I'm wondering if you're adjusting them the opposite of how they should go. Since your problem continues after adjusting. As was posted earlier, there have been rifles shipped from the factory that have loose barrels. Although unlikely, that would also cause your problem.
Newbie questions aren't a problem, we're here to help a fellow enthusiast if possible. Keep us posted on any progress.
And welcome to the forum!