Turing Machine that always returns a blank tape
While the tape is infinite, the amount of characters written on it is finite at any given point in time.

As sasha indicates in their comment, we usually assume that the tape is initialized with a special blank character. Given a Turing machine, you can modify it so that whenever it visit a cell having the special blank character, it replaces it with some other blank character, which it treats the same as the special blank character. Now at any given point in time you can find the (finite) extent of tape which has been visited, and clear it if you wish.