pump parts

Karisa
How do I go about cleaning the tubes? 
How does everyone clean the parts to their pumps. I find it hard to get all the areas. Wondering if there is an easy way that I'm not doing. 
Also how often should I buy new parts? Membranes, tubes, etc.
I only pump once or twice a day and he only has 1 bottle a day other than that he's breast fed.