Not sure if this helps but windex multisuface cleaner contains ammonium hydroxide ( aqueous ammonia) at only .1 to 1% solution most household ammonias have 5 to 10% ammonia in an aqueous solution. Could it be that at the lower concentration the pH is not high enough to stop the etching acid quickly and the reaction is continuing ? Just a guess and suggestion. Oh and if you are using the outdoor muti-suface-concentrated cleaner it has no ammonia but I still alkaline due to the sodium carbonate
Last edited by RhysMichael; 1st June 2013 at 05:28 PM.
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