How to clean linen liner

My first sourdough turned out great despite the fact that I only stretch and folded once and bulk rise was a couple hours too long followed by unplanned overnight retard (life got in the way).

Anyways another mistake i made was that I was pretty stingy when I floured my brand new basket liner. Now I have little bits of dried dough stuck to it. The bigger pieces came off just fine. I'm wondering if I need to worry about it, throw it in the wash, or just carry on?