long-term use

For those of you who use your cup for long-term wear (meaning for more than just your period), how often and what method do you use to clean it? I usually just use mine for a week during my period, but I've been using it "dry" waiting for my period to come for a week already. I've been rinsing it twice a day like I would if I were on my period. Is this enough, or should I boil it periodically?