Definitely, you should clean it after every use. This way, you can enjoy fresh tasting coffee every time. Apart from enjoying fresh coffee, it will also ensure hygiene. Leaving your machine with stale coffee grounds and drippings can forge contamination. Cleaning your machine daily and on a regular basis also ensure that your machine will last even longer than its life span. As for the user manual instructions on how to clean your machine, yes there will be instructions that are easy to follow.