I am surprised to find a Schneider lens on such a bargain priced camera. I use Schneiders on my enlarger and my 8" x 10" large format camera and there is no one better in the lens biz. Consider investing in Adobe Photoshop Elements ($99) for processing your pictures. It is the best picture processing software and contains most of the key elements of Photoshop. Punching up the contrast, shadows, reds, and yellows in those mountain shots will really make them leap off the screen.
Be sure NOT to use canned air to clean the insides. The propellant in those cans is liquid and can foul up your system. It can easily escape from the can. Instead, talk to your local camera store and get a large rubber air bulb, sometimes called a "hurricane bulb" for cleaning that unit.
www.porters.com is a great place to buy accessories. Their prices are some of the best you will find. Their specials can be amazing.
The Schneider lens is a coated optic lens, so be careful what you clean it with. Those coatings help color accuracy reduce flaring. Either use Kodak tissues and Kodak lens cleaner or use Amway See Spray. I have been happy with both, and find the Amway stuff easier to work with. Use a microcloth to do the cleaning. The National Geographic photographers use it, too. You will see them using it in their documentaries. I use the Kodak fluid and papers when I need to do a serious cleaning or when the lens has become fouled. The See Spray is a convenient way to do frequent touch ups so you get the most from your gear.