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VINEGAR must works.
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But you need some more conditions:8 r$ b9 Y& |2 K- M
$ v, y% w; `: D/ k! I; v* S1. 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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2. the temperature of the vinegar should be around 40-50 degree C.' C9 y; R8 M6 p! b- Z8 y9 M
9 [0 l# O+ U: Y1 h" D9 L3. At least 1hr per day for around 1 or 2 monthes, you will be OK.% H; C3 b* D8 V' T' Y8 f8 }7 f
8 i4 a2 R" g; n$ l7 ngood luck. |
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