Last month the CF!Quilters were asked that we not wash our quilts before donating them, as it created some question as to whether they were new or used.
I like to wash everything before it leaves my house, because not only does it get rid of markings, chalk dust, cat dander, and general griminess (that looks like it should really be spelled "grimyness", but the red squiggles under the second spelling suggest otherwise), but it also sends the message that 'Yes! This can be washed just like your sheets and towels.'
Apparently, that message wasn't being received.
So, when I put the last stitch into this . . .
. . . I threw it into my new dryer and put it on Air Dry. Remembering my research into dealing with a down comforter (2021, helping out my parents), I threw in 4 tennis balls to keep things agitated (and, I hoped, knock some of the chalk markings out of the top). It also gave me an opportunity to learn what the dryer thought was long enough for Air Dry (30 minutes--now written on the control panel with a black marker). After an hour there was a satisfactory amount of lint in the trap, and no discernible chalk lines.