I have been trying to alternate 2 PUL covers during the day, but I'm not having much success. Once they get wet (ie. the first time they are used), they smell. I put them on the change table to dry until the next change - but they often don't dry in time & continue to smell. Do they have to go in the sun every change? (because that's going to be a major pain taking them up and downstairs all the time!). Any other suggestions for improving the smell - my poor DS always smells like wee!!