Recently had my car painted and when they sanded the old paint off down to the metal they got red paint dust all over the inside of the car. This cleaner was great in removing the red tint all over the inside of the car. The stitching on the door panels and seats was red. Using a tooth brush with this cleaner cleaned the stitching  up. Since this dries flat and not slippery I will keep using it for my rubber floor mats. To finish off the inside of the car and to provide UV protection I then went over everything with Meguiars #40 Vinyl and Rubber cleaner. The #39 is a heavy duty product.  My go to product for regular maintenance will be the #40.