Methods and materials

My methods and materials are:
1) Obtain the following equipment:
-5 plastic cups
-100ml non-medical methylated spirits
-100ml vinegar from the kitchen
-100ml salt water
-100ml plain water from the kitchen tap
-100ml olive oil
-5 identical iron nails
-1 tray to hold utensils on
2) Pour each of the 5 liquids into a plastic cup
3) Place an iron nail in each cup
4) Place cups on tray in a shaded room-temperature environment
5) Observe any changes during a period of 3 weeks
6) Record an observations made
7) Repeat steps 1-5 to ensure a fair experiment is undergone
8) Clean up?

I'm not too sure whether leaving them in the sun or shade makes a difference to the rate at which the iron nails will rust but as far as I know and think, I don't belive so. However, I will attempt to keep the tray in a shaded room-temperature environment as much as possible.