we use the spiky blue balls in the dryer-- I don't know if the clothes get drier per se, because we didn't monitor usage carefully without the balls.
but I can say for certain that the clothes come out softer. And I get the feeling that the dryer does work a little faster. I've also noticed that there are less "moist spots" in pockets or sleeves - I guess that is because the balls whack 'em and don't let them stay folded upon themselves as much.
The softness advantage is extra helpful as we frequently line-dry everything, then throw it in the dryer for less than 5 minutes to soften/fluff/make sure it dried through (the washer washes faster than the line dries, usually).
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