After 30 minutes you will want to lightly scrub the rusty surface.
Rust removal floor pan.
Alternatively soak the pan overnight in a solution of water.
Take a sponge with a scrubber and scrub at all of the rust spots using the heavy duty scrubbing side.
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.
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.
The front where the pedals are the middle under and behind the front seats then the section under the rear seats.
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.
To scrape off the rust cover the bottom of the pan with a thin layer of salt and scrub it in using a brown paper bag until the rust is lifted off.
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.
Patch panel rust repair full floor pan vs partial floor pan.
The baking soda will help wick up and remove rust that is in the pan.