need a carpet clean up strategy please; be creative/clever

If you consider the rug as two elements, the weave pattern and the color, you might contact the manufacturer and obtain a large enough sample that has the same weave and in almost any color. Moving on to Lab Color, the texture (without the stains) will be available in the L channel and the desired color can be created in channels  a  and  b. This will allow you to obtain the color without jeopardizing the dimensional quality that is carried in the L channel, the contrast of which can be adjusted separately without affecting the color. Note also that the angle of the weave must be considered along with the dark-to-light value shown in the current rug. (It can be adjusted with Curves.) Without the help of the manufacturer, another possibility would be to do a Google search for a similar weave. The color is not the problem. The goal is an unblemished L channel. (Then return to RGB.)