No there isn't, and every ones tank and needs will be different depending on stocking with fish can corals. All bio loads will be different as well as feeding habits and everything. Many places that sell cleanup crew packages offer to many critters, up to 1 per gallon type packages. Some will say you need 55 snails for a 55 gallon tank, not true. I would agree with fedukeford's suggestion on snails and hermits but will add that the scarlet hermit is the one to get, not the blue leg ones.
As far as a tank cleaning itself....never going to happen, but the cleanup crew helps as well as a healthy amount of pods and worms. There will always be a need for good old fashioned elbow grease, scrubbing and scraping.
Thomas