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VINEGAR must works.7 f; w& @& p" I# K
5 L% C( ~# k% w: v1 eBut you need some more conditions:$ `- F7 O! b/ [. z2 Q, h
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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.( m8 u+ R( U, _$ T: Q
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2. the temperature of the vinegar should be around 40-50 degree C.! \( |: y: G0 w; t
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3. At least 1hr per day for around 1 or 2 monthes, you will be OK.6 [7 L/ I3 Q$ E* ^3 ^
1 `3 N. n& ^. f* ^5 Ogood luck. |
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