To remove wrinkles from bed sheets or duvet covers, all that is needed is a spray bottle of water and a little bit of tension applied to the fabric.
A fitted sheet, when placed over the mattress is already under some degree of tension. Simply spray, spritz, or mist the fitted sheets with your water bottle.
With a flat sheet, place it on the bed, tuck the foot. Then grab a corner of the flat Printed Sheets at the top of the bed and gently pull on the fabric until it is a little taunt. Then mist the sheet with the spray bottle of water.
With the pillowcases, stuff them with your pillows. Then suspend the pillowcase by the cuff with one hand and lightly spray both sides. Now hold the pillowcase at the cuff with both hands, lightly shake the pillowcase up and down. This will create tension on the pillowcase.
With a duvet cover, go to one corner, grab the cover at the corner and lightly pull on the fabric to apply tension to it, then spritz the top side, repeat on the other three corners.