Remove the hairpiece before washing it, and then use cool or cold water
Use good mild shampoo and conditioner
Use argan oil, sparingly, for extra restoration
Release the lace fro the adhesive thoroughly with isopropyl alcohol so you don't pull knots out
Wash lace with water flow from bottom to top to prevent wash through of hairs
In case of highly chlorinated or very hard tap water, use bottled or filtered water
Do not use a hair dryer or any hot tools
Do not force out tangles. Comb the ends first and then go a bit lower with each stroke
Try a smooth pillowcase such as Satin or high end cotton
Frayed lace: If you suddenly see yourself in a mirror with the sun hitting your hairline and there is an uneven frayed mess of polyester not in contact with your skin, you may have frayed lace. This can usually be rescued and see you through until your new unit is available. With good lighting, a black background and your best eyewear, carefully trim off the frayed lace edge with sharp scissors and create a new hairline. It will not be as nice as the original edge but it will not catch the light like the frayed polyester.
Torn membrane: Until you get your next unit or have a factory repair, use strong single-sided adhesive tape to bind the two sides of the tear together and prevent it from spreading and becoming a split-in-two unit.
Distressed human hair: If you have been a bit careless with harsh shampoo, sunshine, chlorinated swimming pools or general abrasion and your hair feels dry and rough, use a keratin or silicone conditioning treatment and hot water to deeply moisturize the hair and then cold rinse it to close the cuticle layer back down. This will smooth it out until you can get your next new unit into service.