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<p>[QUOTE=&quot;rlm&#039;s cents, post: 498869, member: 7957&quot;]I am pretty sure nic-a-date is not acid (ferric chloride?), but I cannot seem to find it now.&nbsp; I will repeat what I said earlier &quot;IF YOU DO NOT KNOW WHAT YOU ARE DOING WITH STRONG ACIDS- DO NOT USE IT&quot;.&nbsp; Sulfuric, hydrochloric, and nitric acids can cause severe injuries and death.&nbsp; Hydrofluoric acid is way worse than the others.&nbsp; There are so many other acids that will work better and are relatively safe to use.&nbsp; There are several threads here about using vinegar.&nbsp; Users seemed quite happy with the results.&nbsp; Some drain cleaners use phosphoric acid which should be faster (even when diluted) than vinegar and much safer then the stronger acids.[/QUOTE]</p><p><br /></p>

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