Make Your Own Liquid Fabric Softener

6 cups HOT water
3 cups white vinegar
2 cups Suave Refreshing Waterfall Conditioner {or other favorite scent}
What Youll Do:

Mix conditioner & hot water well, until conditioner is dissolved completely.
Add the vinegar, and mix well.
Store in a large container {empty fabric softener container, empty large vinegar bottle, etc}
Pour into a downy ball or use approx. 2 tbsp. in the fabric softener spot in your laundry machine then wash!

This is the recipe that I use for my softner, but I use the cheap VO5 conditioner and I have one clean liquid laundry soap jug full and a one gallon jug full of softener. Plus I make my own laundry detergent.

I always do the opposite. Hang clothes on the line till dry, then fluff in the dryer before you fold and put away.

Sorry, I forgot to say that it should be added to the rinse.

I too line dry (weather permitting, I live in UK) and I find that approximately 1/2/ (half) a cup of white vinegar seems to cut out the "cardboard".

To avoid stiffness in line dried clothing, simply put them into the dryer for 7 to 10 minutes; then hang on the line!