Originally Posted by ckcowl

to (pre-treat) fabric for dyeing or printing all you have to do is...
pre-wash with detergent---to remove any sizing, oils, soil that may be in the fabric that keeps it from taking the dye or ink. do not use fabric softener.
then- you can either use bubble jet set (follow the instructions) or soda ash---i use soda ash since i dye alot of fabric so always have it on hand-
soak the fabric in the soda ash solution-then hang to dry. press your fusable (i use freezer paper to run my fabric through the printer) to the back side and print your pictures as usual- then allowing the ink time to dry/cure -use a press cloth & heat set. i often heat set a few times- allowing it to cool between (but that's just me being---cautious) then before using in a quilt i run cool water through my pictures to rinse out any excess dye/ink.
when you see (prepared for dying/printing) often it is simply pre-washed with no other treatment done to it.