I have hundreds of FQs: they are pinked with my rotary cutter on my original hard as a rock, non-healing Fiskars mat.
Beware! Rotary pinking blades will cut up your mat something awful so use an old mat!
I wash in hot water with one teaspoon of original blue Dawn Dishwashing liquid, the usual amount of Tide Free, and a Colour Catcher for good measure. When the load is finished, I lay each FQ across the top edge of the washer and snip off any hanging threads before tossing into the dryer.
Dry on low heat, remove when almost but not quite dry, press!