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VINEGAR must works.# e& N7 p# E6 K
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But you need some more conditions:/ m x; u' Q1 v0 U7 p. C1 P& s
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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.
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" Z& s( m2 k% j4 L2. the temperature of the vinegar should be around 40-50 degree C.
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3. At least 1hr per day for around 1 or 2 monthes, you will be OK. Z5 \, e7 u" v& T& L3 |: \
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good luck. |
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