I will use 1/4 white vinegar to 3/4 warm water. Put it on a white towel and blot the areas. you can spray it on but if its like car headliner you don't want to get it to wet.
I clean carpets and do flood work and sometimes have to take browning off of carpet from water damage and we use Fiber Rinse which is an acid and so is white vinegar. What you are trying to do is neutralize alkalinity and residue.
Hope that helps. If not you can call any carpet cleaning supply store and ask them to direct you to the right chemical but I would try the white vinegar first.
