What is the best way to clean a Rayon or Rayon/polyester shirt?
The simple answer is: what the care label says to do. Rayon is a cellulose-based man made-fiber with characteristics of cotton and linen. Most care labels require cold water gentle wash with a cool “iron” pressing. If a rayon or ray/poly shirt is finished using a machine (hot “iron” you run the risk of producing a shiny finish and greatly reducing the life span of the shirt.