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VINEGAR must works., f. b* G% r1 x4 u% q
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But you need some more conditions:& w8 c t, m9 A+ H+ w9 ^! ]
+ |, w: B; y& n1 _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.# Y; x! }* f# `: @8 S" X
6 j5 X. }; j5 j7 F2. 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.. m' D; A0 s; C: g
_- t; u3 G/ G$ ?good luck. |
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