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VINEGAR must works.
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+ Z% F: Q# N- h1 hBut you need some more conditions:9 \, t# _9 S: k& z2 G+ C
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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.5 p( _. z3 P) E
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2. 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.
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good luck. |
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