i'ma do this too pretty soon -- my gray carpet is nasty from the previous owner. Not really wanting to use Rit Dye.. seems too messy and time consuming, and some of the pictures I've seen done turn out purpleish black. I'm definitely gonna pressure wash it to get out whatever dirt I can first.
I'm still researching on the fabric sprays.. Here are some vital links.. maybe you or anyone else can help with the decision. There isn't much info on TI about fabric spray.
TI Thread
The Simply Spray Upholstery Fabric Spray looks pretty promising.. Check out these links for it:
Demo
2nd Link
The above link is $14.99 for an 8 oz. can.. That's a lil pricey, since I'm not even sure how well it works.. and if it does, not sure how well the carpet will eat it up. The site says to see how our carpet reacts to water, and it will be the same for the spray.. so I'll have to do that.
I also found this product on eBay for $55 shipped for 6 8oz. cans, so approximately $9 a can.
btw, change the topic subject, so that people can search for this thread on both removing and spray painting carpet.