I tried everything to remove the nasty big white stain on the floor behind of the driver seat. It didnt work. I am thinking about to send my car in the shop to get it removed. I know it costs alot, but I dont know another way to remove it. Any ideas?

The floor is dark gray.

What is the stain exactly? 303 makes a good stain remover. Or locally you can buy Resolve (test in a hidden area first)

Not much information to go on so I'll post this-hope it helps...

To remove stains the surface tension that bonds them must be released, then the stain encapsulated and held in suspension to be removed. When cleaning a stain, try detergent and water first. If this does not remove the stain, then try a stronger type cleaner (303'M Cleaner & Spot Remover or Folex Instant Carpet Spot Remover) once fabric is clean apply a fabric protection (303TM High Tech Fabric Guard)

I’m repeatedly asked which product is the best interior cleaner. There is no one-product answer, as the so-called all purpose cleaners (APC) do not remove every stain, different stains require different solvents to remove them.
Between these five cleaners you should be able to remove 99% of stains occurring in a vehicle and around the home –
a) 303™ Rug / Upholstery Cleaner & Spot Remover
b) P21S Total Auto Wash
c)Woolite® Heavy Traffic Carpet Foam
d) Hoover Deep Cleansing Carpet/Upholstery Detergent
e) Folex Upholstery Cleaner & Spot Remover

Classifying stains-
a)Organic stains- these include proteins and fats, body oils, mould yeast, bacteria, bugs and carbohydrates. Most of the stains found in the vehicle interior are of an organic nature and require an alkaline type cleaner. Some organic stains (i.e. blood, vomit, urine) should be removed with an enzyme type cleaner and a disinfectant applied to the area
b)Non-Organic stains- mostly found on the exterior of the vehicle, hard water scale (calcium) lime deposits, Road tar, grease and oil film, and require an acidic type cleaner.
c)Petroleum soils - substances that do not contain water, nor are they miscible, these soil types include, motor oils, and crease and road tar, and require a solvent type cleaner.

Stain Types-
a) Water Soluble Stains-These stains can be dissolved in cool water or loosened with water based cleaner, coffee; soft drinks, cocoa and chocolate are good examples.
b) Oil soluble stains- These are stains that are comprised of oily or greasy substances, which include cooking, oil from fried foods and suntan oil.
c)Combination Stains-These stains contain both water based and oil-soluble properties. Cleaning these stains require treatment with a petroleum solvent followed by water based cleaning solution.
d)Unidentifiable Stains- Sometimes stains cannot be identified. Treat these stains like a combination stain. Clean with a petroleum solvent followed by water based cleaner.

It used to be an orange soda spill. I tried the oxy stain remover spray and it became white. I decided to use the hoover vacuum with the steamer. It didnt remove the stain.