|
|
VINEGAR must works.
7 G% ~1 Q, O+ z; M6 l; w& q# i+ O7 }2 \) R
But you need some more conditions:
. H! @ F9 Y) v- G" ~/ z. P6 \5 P
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.
: a0 x' p( H4 e/ N' {; {3 r; I
; a1 Y' x4 n4 K1 k$ c* m6 O) T2. the temperature of the vinegar should be around 40-50 degree C.# S8 N5 V; ~0 O0 B; P# ^* o& L( a
2 a c U: h$ n" ^ z! |8 c8 o3. At least 1hr per day for around 1 or 2 monthes, you will be OK.
* }( |# X' w* u# a- E, b, X5 O, V3 i- ]! F
good luck. |
|