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VINEGAR must works.
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But you need some more conditions:& p% ?2 ]$ @) ~/ M1 H# ` j
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1. the solution of the vinegar must be at least 5-6%, so it's better you buy a vinegar acid to add appropriate water. \. J* M A8 o: p
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2. the temperature of the vinegar should be around 40-50 degree C.6 k9 d% L& T5 E. R$ W g
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3. At least 1hr per day for around 1 or 2 monthes, you will be OK.' s! v3 z6 B) i7 e. A7 _5 `
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good luck. |
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