Develop blueprint paper using Windex.
Step 1: Grab a container
Order some take-out and rip the lid of the styrofoam container.
Step 2: Fill with Windex
Pour adequate amount of Windex glass cleaner into container lid.
Step 3: Rack
Find something that you can set your paper on so it doesn't get wet but still absorbs the Windex fumes.
Step 4: Plastic bag
Place inside plastic bag so the fumes are contained.
Step 5: Grab a print
Find a nice black and white photograph that you will use for the contact printing.
Step 6: Diazo paper
You will need some blueprint diazo paper. I found mine on ebay for six dollars.
Step 7: Stack them
Place the blueprint paper sensitive side up on a flat surface. Then place the black and white photo face down.
Step 8: Sandwich
Sandwich with a piece of clear glass.
Step 9: Expose
Place in DIRECT sunlight for 4 to 5 minutes.
Step 10: Check paper
After you have exposed for 4 to 5 minutes you should see some discoloration that resembles your image.
Step 11: Develop
Place paper sensitive side down on the rack in plastic sack for 5 minutes or more. Make sure to close the plastic bag so the fumes stay in.
Step 12: Done
Enjoy your Windex print.