Mike - some companies used to sell a powder acid that contained powder phosphoric acid. The harshness of using phosphoric in a powder state and shipping regulations likely eliminated those from the marketplace, although I know a formulator in the UK who still makes one. but that is not going to do you much good.
Although sometimes it is splitting hairs, there are subtle differences in acid rinse detergents and acid neutralizing rinses. Shawn Forsythe, as usual, is spot on in his description.
The original textile rinses were simply acid neutralizing rinses designed to neutralize alkaline prespray residues and prevent browning. As a general rule, they did not contain any surfactants/detergents. They were also used as dye and color stabilizers in rug and fabric cleaning. I know many rug cleaners who still insist on a detergent free acid rinse. We make a product called RinseOut that fits this description.
ClearWater Rinse, which was previously referred to, is an acid rinse that does contain a detergent. I can make several theoretical statements about how that can make the wand easier to use across the carpet and would increase productivity, I think that judgement would be better left in the hands of the actual user. What I can tell you is that in my opinion, having detergent in your acid rinse has several advantages over textile rinses when cleaning installed carpeting. When the spray from your wand under pressure is injected into the carpet, it is always going to reach areas deep in the carpeting that your prespray does not get to. Having the detergent will help to remove this deeply embedded soil. Tests show a higher level of soil removal with a detergent rinse than a textile rinse in carpeting. My opinion is the same as that of Shawn's in that I believe hydroxyacetic acid has a
superior performance to oxalic or glycolic acid when used in the acid detergent rinse formula.
In the end, the "measured" differences between a textile rinse and an acid detergent rinse are small. Both will neutralize residues, help prevent browning, and probably most importantly, leave a nice soft feel to the carpet for your customer.