if you are buying muratic that is used to clean pools use it undiluted. Leave it in to the count of a slow 10 dip it in water bring some x-fine steel wool across it rinse and shake excess water off and dip it again. keep repeating untill it is done. If you find it is not removeing change to the count of 20. watch muratic it is dangerous to work with and if you get the fumes in your lungs you can end up in hospital. Basically it is just dulitued sulperic and does not store well it weakens quickly especially with temperature changes use the left over to clean concrete do not dump it down drain
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