I believe that to be correct. And think about it, any soap or detergent that you use will leave a residue in the fabric. It's like washing your hair with shampoo, and then not rinsing it. I would use a sponge, dampened in a solution of amonia and water, and of course a little elbow grease. Perhaps you would need something else for stubborn stains, but for overall cleaning, amonia will evaporate without leaving a residue. That is how I clean my carpets, that way they don't seem to get dirty right after you clean them.If that is the same product avaliable in NZ, I would not use it...sure will clean up great, but also will break down the stiching and threads later.