Someone told me you can get stuff which you put ?in the tumble dryer with your wraps and it will make them waterproof again. I think she said it was designed for outdoor coats etc but works for nappy wraps too. Anyone tried this? How much is it and what does it involve? I'm on DC3 and so my wraps are just not as watertight as they were and I'd love it if there was a way to avoid buying a whole new set.