YSK: You should regularly pour white vinegar into your toilet's water cistern/tank to avoid calcium buildup in the toilet's flushing system, which can damage it.
from /r/YouShouldKnow
YSK：你應該定期將白醋倒入馬桶的蓄水池/水箱中，以避免鈣質在馬桶的沖水系統中堆積，從而損壞它。
YSK：你應該定期將白醋倒入馬桶的蓄水池/水箱中，以避免鈣質在馬桶的沖水系統中堆積，從而損壞它。
YSK: You should regularly pour white vinegar into your toilet's water cistern/tank to avoid calcium buildup in the toilet's flushing system, which can damage it.
from /r/YouShouldKnow