CLEANING GLASSWARE 3 



at least fifteen minutes in the steam. After removing test 

 tubes from the cleaning solution: 



1. Wash them in water with a test-tube brush, using 

 cleaning powder if necessary. 



2. Rinse with tap water till clean and free from cleaning 

 powder. 



3. Rinse with distilled water. 



4. Drain. 



5. Test tubes and other glassware, flasks, pipettes, etc., 

 may be rinsed with alcohol to facilitate drying, then drained. 



Flasks. After treating flasks with cleaning solution: 



1. Wash them as clean as possible with tap water 

 and a flask brush ; use cleaning powder if necessary. (When 

 using cleaning powder, empty all water out of the flask, 

 wet the flask brush with tap water, dip it in the cleaning 

 powder and then rub the soiled portions vigorously.) 



2. Rinse with tap water till clear and free from cleaning 

 powder. 



3. Rinse with distilled water. 



4. Drain. 



Petri Dishes. After removing Petri dishes from the 

 cleaning solution: 



1. Wash them in water, using cleaning powder if nec- 

 essary. 



2. Rinse with tap water. (It is not necessary to use 

 alcohol or distilled water.) 



3. Wipe immediately with a clean physician's cloth. 

 Pipettes. 1. Place pipettes delivery end down, in a 



glass cylinder (graduate) in cleaning solution and allow 

 them to stand over night. (Steam may break the glass 

 cylinder) . 



2. Pipettes which have been used should be washed 

 immediately. Grease which cannot be removed with 

 water should be treated with 10% NaOH and then with 

 cleaning solution. 



3. Rinse with tap water, followed by distilled water. 



