Clicking on the title to the left takes you to a large article I wrote for the 356 Registry Website. It can be found in the Technical Articles section with the title "Restoring Original Floors". The article is 22 pages long!!!
Below are some areas where I have cleaned and restored (under hood, fenders and battery box) on Miss April. I used the same techniques as outlined in the article.
Here is how it looked when I bought the car.....
I will undertake the bottom side of the floor in the future. Good news is they are solid! Here are some photos of the top side of the floors- after some cleaning I did. Nice and solid!! The brown color on the vertical walls (inner longitudinals) next to the floor is glue, not rust. It is the left over glue from the carpeting.
I was able to restore and reuse the original "horsehair" underlayment on the floors. I wrote about it in the Restoration- Blog section. Here is a link so you can see what I did.