Car Carpet - Smelly car

I am not sure if I mentioned but the interior of the car is very bad and in fact it smells. The reason is that the car had a leak into the car and the carpets were pulled out.  I pulled them out and they are smelly dirty and discoloured. So the first thing they need is a good clean.
Then  as some of the carpets are faded I think I will use a

"HI-TECH DYE PAINT LEATHER PLASTIC CARPET AND VINYL REFINISHER INDOOR OUTDOOR"



VELTEX CARPET SNAPS

 

Mouldy back of carpet

Front look ok