I use bleach ( sodium hypochlorite or commonly known as chlorox used at home) as H202 ( hydrogen peroxide) are not sold here, or was it ban i'm not sure cos some years ago it was easily bought. H202 will work too.
For bleach i prepared 5% in distill water and sterilise 5 minutes.
Using H202, bleach or ethanol has margin of error and you may vary the time 4 minutes and 3 minutes for different flasks.






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