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VINEGAR must works.. i% P/ q1 {; K6 W ?
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But you need some more conditions:
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' S" w. \! T3 h6 r; j1. the solution of the vinegar must be at least 5-6%, so it's better you buy a vinegar acid to add appropriate water." X1 O1 d5 \$ @' R. O, @* V
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2. the temperature of the vinegar should be around 40-50 degree C.1 ~2 |8 T8 V/ C$ L+ ]
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3. At least 1hr per day for around 1 or 2 monthes, you will be OK.
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/ {3 v/ f U* [- I/ K7 g6 wgood luck. |
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