On my Miele, the PP cycle at the first set of "rinses" begins by adding cold water while tumbling, draining a bit, add more cold water, tumble, drain... for several times. This is as opposed to the normal cycle which adds cold water only once at the end of the wash/first rinse; then draining.
Purpose of all this palaver is that even cotton or linen textile can experience thermal shock if water temps go from hot (or in the case of Miele's very hot water of up to 200F), to cold too quickly. Even commercial washers have methods to gradually bring wash temperatures down.
Today's man made textiles, especially polyester are thermoplastic, that is heat can damage and or cause permanent creases/marks if the material is manipulated while it is hot or warm. My Miele does not spin between rinses during the PP cycle, and only has a short final spin.
Problem is polyester does not shed oils/muck easily, thus cold water or even warm may not keep it clean and bright, especially whites. I wash poly and poly blends at 120F (IIRC my Miele's manual recommends up to 140F or maybe 180F when using the PP cycle), to get good cleaning and bleaching (with oxygen bleach), results. Happily the PP program ensures that by the time the machine reaches the final rinse everything is quite cold.
L.
Purpose of all this palaver is that even cotton or linen textile can experience thermal shock if water temps go from hot (or in the case of Miele's very hot water of up to 200F), to cold too quickly. Even commercial washers have methods to gradually bring wash temperatures down.
Today's man made textiles, especially polyester are thermoplastic, that is heat can damage and or cause permanent creases/marks if the material is manipulated while it is hot or warm. My Miele does not spin between rinses during the PP cycle, and only has a short final spin.
Problem is polyester does not shed oils/muck easily, thus cold water or even warm may not keep it clean and bright, especially whites. I wash poly and poly blends at 120F (IIRC my Miele's manual recommends up to 140F or maybe 180F when using the PP cycle), to get good cleaning and bleaching (with oxygen bleach), results. Happily the PP program ensures that by the time the machine reaches the final rinse everything is quite cold.
L.
