My Car Is A Solar Oven

Today I took out my thermometer and took the temps on the water I have laying in the back window. Yesterday I uploaded some photos of my new solar shower and had the bright idea to check out the platypus.
And, hey, how about a soda bottle filled with water, while I'm at it.

I found the platypus had a temp of 148 degrees, at 2 p.m.
The soda bottle water temped at 142.
The solar shower bag is actually on the seat of the car. I gave it an extra hour to heat because it wasn't receiving direct sunlight.

Now, I temped it and it reads 118, which is plenty hot for a shower. If I wanted to lay it up in the back window I am certain it would achieve the same temperature as the bottles.

So, who knew my car was actually hot enough to cook in the back window? I bet I could fry eggs on the trunk lid. It feels every bit as hot.

The interior of the car is actually gray. If I places a black cloth beneath these bottles, I'm almost afraid they'd burst with boiling water. Maybe tomorrow?