To remove the old grease and waxoyl i have used bits of the old carpet and cut into rectangles sort of five by seven inches or so.
Rust removal floor pan.
If you replace left and right side partial panels and leave the original tunnel intact you re welding about ten more feet of sheet metal versus replacing the whole floor.
Patch panel rust repair full floor pan vs partial floor pan.
Alternatively soak the pan overnight in a solution of water.
The floor pan is such a large area i had to tackle it in three sections.
If it s just surface rust the most effective removal process is simply using a grinder with a wire wheel to clean up the old sheetmetal.
If you want to remove rust from pots and pans use a gentle abrasive like salt that will scrape up the rust without damaging the metal.
The front where the pedals are the middle under and behind the front seats then the section under the rear seats.
Curiously replacing the full floor pan is actually less work than doing two partial panels.
Take a sponge with a scrubber and scrub at all of the rust spots using the heavy duty scrubbing side.
Then make sure you properly seal the floor pans.