Everyday Cycle and Synthetics
Ever try getting the stains out of that?
Not an easy task. Cold water, warm water and even hot soaking over several days, followed by warm and hot washes can prove difficult in removing stains.
So a cycle designed with these fabrics in mind will be washing to remove fresh stains and odours - not treat stains like a regular cycle might. Also, since synthetics often dry easily, I can't imagine a standard testing load would yield good rinsing - they're very easily rinsed fabrics (I wear these sorts of collared t-shirts for work).
Another example: "Robe" for altar server's at Church. Having recently started this, one of the "robes" (cannot recall the proper name). Clearly not washed for years, or not washed properly for years. Made out of shower curtain material, so I knew what I was probably in for.
Started with a warm soak, with plenty of product (Detergent + Stain remover). That did well. Then it went into the Miele for a Quick20 wash at 40º for rinsing purposes, mostly. Hung up to dry.
Next day, washed our shower curtains, so ran a Delicates programme in hot (60º) water. That tidied the rest up reasonable well. There is still some slight yellowing round the collar, but far less noticeable than before. And no grime around the cuffs, either. Still, a lot of work for some minor stains.