Pet litter box cleaning system

A shielded litter box cleaning system, comprising:

• a. a pan having a base and a peripheral wall defining an interior space configured to receive a predetermined amount of litter, wherein the peripheral wall includes a rim, an inner surface facing the interior space, and an outer surface opposed to the inner surface, wherein the rim further includes an inner edge defining an opening for a pet to enter and exit the interior space, wherein the rim includes an outer edge opposed to the inner edge;
• b. a liner assembly for placement in the pan for the successive sifting of litter and removal of animal waste, wherein the liner assembly includes a plurality of thin and flexible sheet like liners arranged as a stack, wherein the liners are large enough to completely cover the base, the inner surface, the rim, and drape over an outer surface of the pan, wherein each liner has a plurality of sifting apertures, sized and configured to retain organic waste and urine clumps above the liners, while allowing unsoiled litter to flow downwardly to a lower layer when an uppermost layer is lifted;
• c. a liner retainer configured to place over the peripheral wall of the pan to retain the liners in a fix position, comprising:
• i. a retainer wall extends around said outer surface of the pan, wherein the retainer wall has a height to retain the liners against the said outer surface, wherein the retainer wall has an upper edge;
• and
• ii. a retainer roof extending inwardly from the upper edge of the retainer wall, wherein the retainer roof has an inside edge extends inwardly beyond the inner edge of the rim below it, and
• d. a shield has a height to prevent a pet from urinating and defecating outside the pan when positioned therein, wherein the shield abuts the inside edge of the retainer roof, wherein the shield includes a shield portion configured to attach to said inside edge of the retainer roof.