Yadda za a wanke flask ɗin ruwan zafin da ya dafe cikin sauƙi
matakai 3 kacal sun isa.
1. A sami baking soda,
sai a zuba kamar cokali 4 ko 6 sai a zuba veniger wato ma’u khal, sannan a zuba ruwan zafi a duk a cikun flask ɗin.
2. Sai a bar shi tsawon mintuna 8-10 amma fa kar a rufe shi da murfin don zai iya ɓaci, sai a saka shi a ciki faranti ko (sink). Don in an bar shi haka, zai taso sama.
3. A sami burushin wanke kwalba a gurje shi tas, sai kuma a sa ruwa a ɗauraye.