my first box of orphan blocks had a big stack of 9 patches, made from either 1.5" strip sets, or 1.5" scrap squares. Testing the exact place on my various machines over the years where the sweet spot 1/4" was to get that perfect 3.5" block. So in that sense I always make sample blocks
Sometimes it has taken up to 6 to get the needle setting, where on the foot, perfect.
I've always been a prewasher, hot rinse in the sink, wring and pitch in the dryer. Works a treat. My lungs and sinus have never been able to take all the finishes in fabric, it is just common sense for me.
I've never bought a color catcher in my life. and if someone gave me a box of color catchers and/or special soap with a gift quilt, that quilt would go on the back shelf never to be seen again. My instructions when I give a quilt. Throw it in the washer and dryer just like a load of towels. Enjoy it, it just gets softer each time.