Thanks for all the suggestions.
Since I was unable to get an inexpensive hand pump to siphon the summer washer fluid out of the tank (lots of things are not easily available in New Brunswick as they are in the big cities), I got rid of it by using it all up on my windshield which became super clean over the course of a few days.
Someone suggested that I could also have used the following method to empty the reservoir :
1) Get a hose or a short length of transparent aquarium airline tubing from a pet store (about $2 for a 2.5 metre tube) that will reach the bottom of the tank and long enough to reach the container where you want the fluid to be transferred to. This container must be below the level of the washer tank. Clear tubing is best as you can see through it.
2) Clamp off one end of the tube tightly using vice-grip pliers or something similar (if you don't have one, now is the time to make friends with your neighbours)
3) Go to a tap and fill the open end of the tubing with water or fill this tube with the same liquid that is currently in the reservoir and ensure that the clamped end stays as low as possible.
4) Quickly insert the open end of the tubing into the washer tank that you want emptied and keep spillage to a minimum.
5) Unclamp the other end of the tubing and let the water inside the tubing do the siphoning into your container.
This method is supposed to let you drain the washer tank completely and safely without the risk of swallowing washer fluid. I will try this in the spring.
If the above sounds too complicated, read instructions on the link below on "How to Create a Siphon":
http://www.ehow.com/how_5656407_create-siphon.html