silk

I have a silk duvet cover that used to be lovely but I woke up yesterday morning to find it uncomfortable. The surface has developed a large area of lint and has begun to pill. Washing hasn't helped and while application of sellotape has helped remove the lint, there's such a large area that...

My silk pillow cases have lost their silky sheen. How do I get it back? I've tried rinsing with the weak vinegar solution that many websites suggest but that hasn't worked.