Thank you, all! I had two beakers that had some residual silicone grease run down to the bottom of the boiling flask and not come out with hot soapy water.
When I succeed in preparing it, or if a sample of it already prepared by someone else ever falls into my hands by whatever chance, I will be in a position
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Here you have some guides:
https://www.thoughtco.com/how-to-cle...assware-606051
http://chem.chem.rochester.edu/~nvd/...lean_glassware
Question: What do you all use to clean your lab glass?
zoas23 1 Hour Ago