There are 2 ways to communicate your special preferences (in the order of effectiveness):
1) A permanent method: On the name tag attached to your bag.
Either write it yourself, you can write things like: No starch, or No Softener.
Or (recommended), use the Permanent Preferences tab on the right to let us know what to put on your name tag.
2) A temporary method:
Include a note (paper) inside the laundry bag with your instructions every time you send out laundry.