Buy the 30 simolian trash can. Order your Sim to empty it, then cancel the order just as they remove the bag from the trashcan. Then, order them to pick up the mess that they just created. Your Sim will return the full bag to an empty can. Repeat this each time it fills and trash will never have to be brought outside again.
Less bills Keep an unpaid bill until the mailman delivers the next set of bills.
Pay the original bill when your mailbox is filled with the next set of bills. This should cause the bills inside the mailbox to disappear. Then, pick up the mailbox and erase it. Bills cannot be delivered if you do not have a mailbox. Immediately after selecting live mode make them kiss approximately ten times in a row to set their relationship meter to 100.