Hello and welcome from Washington

I do not pre-waswh, bkut test a small patch if I think it might be a problem

Hello and welcome from Germany. I belong to the fabric washing half, I wash my fabrics as I go to use them. If I am only washing a yard or two for a certain project I will wash other fabrics of like colours.
The reasons are chemicals/smells, bleeding and shrinkage.

I wash my fabric because I thought you should...sometimes dark fabric fades...if you do wash, be sure to wash everypiece,since some pcs. will shrink more than others....

Hello from West Virginia and Welcome to the group.
Happy Sewing.

I wash in Very hot water -- usually by hand and then pop it into the dryer with a large towel. If I wash by machine I do it on delicate. Fabric does shrink a bit. And I hate the smell of most new fabrics.

Especially if it is a dark or red fabric. I once make a red and white quilt and didn't wash one of the reds. It ran just enough to spoil the contrast

Mim