Washing Tips
Use the normal cycle with hot water to really penetrate the canvas. Wash alone or with like colors if you must mix.
Drying Tips
Try to line-dry your canvas creations to preserve their shape.
Temperature Tips
If line-drying then you don't have much choice. Warm air is best.
Ironing Tips
When ironing, use a very high temperature setting. Feel free to use the steaming feature of your iron