Honestly, once we were past the first week of BLW, LO's poos were really easy to deal with as they became a lot more formed. I don't bother with a liner at all most of the time as we use stay dry Flips. When I do use a liner, we use fleece as the poo just falls off down the loo. The time when it gets really bad is during teething but with fleece or disposable, liners are pretty ineffective cos it goes EVERYWHERE!