oxyclean, tide with color safe bleach. use the powder and squirt a little water, just enuff to get a foam going and most of the grit out, dont use too much you can always add more. then scurb that **** hard and vacuum it with a wet dry vac then pour water on it and do it again and again till no bubbles or foam is left and let dry in the sun for a good 4-5 hours windows down