I don't use them, but when you do, just make sure you thoroughly wash all the dirt off the car (I know that sounds stupid, but you'd be surprised) and that should help the obsorber to stay clean.
The swirls will come when you get dirt particles on the obsorber or whatever you use to wash and dry the car with and then wipe and scratch them all over the car. The scratchs are small, micro in most cases, but after enough of them accumulate, you'll see the swirls.
Even on a brand new car a lot of the dealership washers will wash the car quick with a power washer and dry it quick leaving a film of dirt on the car, then they dry it by hand and swirl it all up.
I use a high velocity leaf blower, then touch up with Zaino Z8 and a MF towel, not cotton towel. I always make sure my washing mitts and buckets remain clean as well.:xyxthumbs