If one has OCD about washing things - one can sort the strips into colors - soak them in hot water - take them out and roll them in a towel to remove excess moisture - and hang to dry - if you don't have a drying rack - plastic hangers will work or the shower curtain rod or towel bars.
I would not wash them in a machine - but a hot water soak will take care of any shrinkage and let you know if there are any dye issues.
I know that over 95% of the people would not bother - but if one WANTED to, it can be done.