Alcantara seat detailing/restoration advice

[ShadowofBob]

So I picked up a full set of B6 S4 Black leather/Silver alcantara seats on the cheap with torn fabric and some staining on the rear seat. I've mostly gotten all the stains on the back bottom cushion out with just warm water blotting and a clean towel by following the official alcantata stain removal tips.

I purchased a replacement front seat from a flood damaged car to take the back and bottom fabric off of and transplant to my good seats with tears. The upper half goes to the passenger seat and the lower to the driver. Unfortunately when the seat arrived it had stains on the bottom portion of fabric that weren't in the auction picture. I used Sonax alcantara cleaner, the hot water trick, lemon juice, and alcohol, but have had no real luck asides from a reduction of stain visibility.

Before:


After:



Does anyone here who details have any advice or other tricks to try to remove these stains? I'll have the fabric off the seats soon too if that makes it any easier. Would a steam extractor have more of an effect and would it be safe to use on the alcantara?

[Avus RS4]

After all you've done so far, it looks like there's not a lot of room for success.
Have you been able to recognize the composition of the stains?
Just by looking at the stains pattern it seems as though it could've been some thick, sticky substance that just dwelled into the fabric, as opposed to a runny, watery type solution.

I have a couple of products we can use and perhaps use a different approach to see if we can make it disappear.
No guarantee at this point of having any kind of success based on what you've tried so far, but we can go for a hail Mary and see what happens.
I'm available this Sunday and Monday if you'd like me to stop by a take a look.
Let me know, and I can PM you my contact info.
~Goose.

[ShadowofBob]

After all you've done so far, it looks like there's not a lot of room for success.
Have you been able to recognize the composition of the stains?
Just by looking at the stains pattern it seems as though it could've been some thick, sticky substance that just dwelled into the fabric, as opposed to a runny, watery type solution.

I have a couple of products we can use and perhaps use a different approach to see if we can make it disappear.
No guarantee at this point of having any kind of success based on what you've tried so far, but we can go for a hail Mary and see what happens.
I'm available this Sunday and Monday if you'd like me to stop by a take a look.
Let me know, and I can PM you my contact info.
~Goose.

Thanks for the offer. I'll send you a PM; I might have some time on Sunday. I have been unable to figure out their composition, but have some guesses. They definitely aren't as water soluble like the stains I dealt with on the back seat. The seller said the seat was on a pallet in storage after the original stain free pictures used in the auction were taken. I'm guessing that it is a grease or oil substance from other parts/equipment as it was a salvage/parts place.