Do not wash anything more than 40 degrees
I still have a tip for inexpensive washing at 40 degrees:
With the spinning wheel (or where else is the stuff from Hobbythek), there is a liquid bleach of Hobbythek (name: Eur ..... something), of which you get 1 cap full with each wash.
It does the laundry at 40 degrees KEIMFREI and bleach still no colors. Super stuff. I wash everything only at 40 degrees!
In addition, you can soak with the stuff and the rinse and cleaning cloths and cleanse so germ-free.