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VINEGAR must works.9 Z/ C: J* a z0 v
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But you need some more conditions:* O' j( g+ {: Q/ Z
" U0 x0 s4 A% ^% _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.% `: o, E) c; H! Y5 X" `
1 s1 Y2 p9 |1 d2. the temperature of the vinegar should be around 40-50 degree C.
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: J# n8 l* J2 N# O- O3. At least 1hr per day for around 1 or 2 monthes, you will be OK.8 B/ T7 R) ? r/ A3 v, V
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good luck. |
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