If you are trying to remove transmission fluid stains from your concrete floor, there are a few different things you can do. Transmission fluid can leave a nasty stain on your concrete floor, but it can be cleaned.
Non-clumping Cat Litter
If transmission fluid has just spilled on the floor, place the non-clumping cat litter over the spill. Use a stiff bristled broom to grind it into the fluid and let it set for a couple of hours. Then, remove the non-clumping cat litter and throw it in the garbage. The non-clumping cat litter will remove all the fluid.
Cleaning the Stain
Apply de-greasing detergent to the stain and let it work on the stain. Spray warm water to the area and scrub it with a stiff bristled brush. If the stain has been on the concrete for a long time, you will have to repeat the process a few times before it is cleaned properly.
If the stain does not come off completely, you will need to use muriatic acid on the area to clean it completely. Pour the acid on the concrete and let it set for a day. Then you can clean it with a broom and water.