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so as to prevent contamination. that should be one point.
So it wont mix
To remove any trace of other chemicals that may still be in the burette.
Rinse with hot water outside try to rinse only outside, stop cork will be loosed and pulled out easily.
Rinse with distilled water and blow dry with compressed air.
SILAR - SUCCESSIVE IONIC LAYER ABSORPTION AND REACTION is a low temperature and solution based process that can deposit atomic layers one layer at a time. The traditional SILAR cycle for a substrate is Dip in Cation precursor solution Rinse with distilled water Dip in Anion solution Rinse with distilled water
 Use distilled water, Jaborandi or Nettle to stimulate growth as a rinse. Lotion requires a generous amount of oil, distilled water, and beeswax.
You could try spraying straight bleach from a spray bottle, and then rinse with either reverse-osmosis or distilled water.
The distilled water will rinse off any impurities and will evaporate during the drying process.
Rinse it out well with water from the sink or distilled water if you have it on hand. Then use eye drops to relubricate it.
Have it professionally cleaned. Or if you live in a very dry, windy place, just bring it outside and rinse it off.
Distilled water is simply H2O, while normal tap water isn't. Tap water has other minerals that could possibly react with the chemical to be used in the conical flask. Washing with distilled water assures the absence of any unwanted deviation in the result.