?????????? ??????? ??? ????????????? ????????? ?? ????? ??????????? ???? ?? ?????????? ?????? ??? ?????????????? ??? ?????? ??? ??????? ???.? ????? ?????? ??? ?????? ??? ?????????? ?????? ??? ???? ???????. ??? ?????? ??? ?????? ?? ?????? ????.As soon as per month, place a single cup of baking soda, followed by 1 mug of white vinegar down the tubes.