Could any Bumgenius gurus out there advise me on what liner to use, if any, with the Freetime? I've heard it's better to use one for ease of catching & disposing of the poos. However, when I tried both a paper and a fleecy liner they both just seemed to trap moisture quite badly. So I've been going without a liner, but have avoided poo'o'clock (put back in disposables) until I sort this out! Does it stain terribly without? As you can tell, I'm a reuseables newbie! Thanks....!