There are a few things to know about the absorber to get the most out of them.  First, before using, soak in warm water, this makes it more absorbent.  Second, keep it clean.  The wort thing you could do is have a dirty chamois and drag it across your paint, this will introduce maring of your clear coat.  I wash it on gentle cycle with a little distilled vinegar then air dry.  When storing, get it as dry as possible.  Ive had them get moldy in the container from being too damp.