I ordered a couple used grovia aio newborns on ebay. the diapers are in great condition but seem really stiff inside. I washed with charlies soap on warm and air dried.
Air drying the cotton makes them feel stiff. With my cotton cd's I air dry them to about 90 percent then toss them in the dryer on low for the last bit. That helps keep the fabric feeling soft.
Drying them in the dryer will get them the softest. If that isn't an option for you (we don't own a dryer) after it's done air drying you can "beat up" the diaper a little to soften it. Roll it around in your hands a little and that'll help too.
BFP #1: 3.28.11 Dx w/ PIH @ 24w
DS Born @ 36w: 11.7.11
6 Days in NICU BFP #2: 8.31.16 Dx w/ GD @ 28w DD Born @ 36w: 4.21.17
Re: stiff used grovia aio nb
BFP #2: 8.31.16 Dx w/ GD @ 28w DD Born @ 36w: 4.21.17