| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| michalby | "I used sodium perchlorate (bleach) to clean schott funnel (filtration funnel) from tea tannins residue (in a plant biochemistry class). I'll try wi..." | Read more » | over 6 years ago | |||
| michalby | "Mineral oil should work. I sometimes use on a professional immersion objectives a mixture of drugstore-bought liquid paraffin (sold as a laxative) ..." | Read more » | over 6 years ago |