The document provides guidelines for cleaning various laboratory utensils. It recommends thoroughly washing utensils before and after use with soap and hot water for ordinary cleaning. Specific chemicals like HCl, HNO3, or potassium bichromate can help remove stains from glass vessels. Metals should never be washed with acids. Mortars and pestles made of glass or porcelain should be scrubbed with brushes and boiled, while those of iron or steel require scraping, boiling, and drying to prevent rusting. Horn spatulas are cleaned with cloth and water but not hot water. Bottles are soaked, scrubbed, rinsed with alcohol and dried in sunlight. Corks are rubbed, rinsed and dried before a final alcohol

1. CLEANSING OF UTENSILS
Dr Pranesh Singh
Dr Poonam Singh

2. GENERAL RULES
 1. Utensil should be thoroughly washed before
use and again washed immidietly after used
 2. Hcl, HNO3 , or Potasium Bichromate may be
beneficial to remove dirt and other stains from
glass vessels.
 3. Ordinary cleaning can be done with soda and
hot water.
 4.To remove greasy or oily materials, methyleted
spirit , ether, benzene can be used
 5. Vessels made up of metals never washed with
acids.

3. PARTICULAR RULE
 1. Mortar and Pestles-
 If made up Glass-
 Firstly the glass morter and pestales washed with hot
water
 Then rub with hard brush and cold water
 Then use soft brush
 Washed under tap water
 De=ried at high temp
 The poured small quantity of alcohal inside mortar and
burn inside, precaution should be taken for handle of
pastles made up wood

4.  If made up of Porcelain-
 First wash with cold water
 Then scraped with brush
 Cleaned with boiling water
 Then rubed with fine sand and rinsed with purified
water.
 Then throughly dried up at high temp.

5.  If made up Iron or steel-
 Firstly washed with running tap water
 Then scraped with hard brush and cleaned with
boiling water
 Again rubed with soft brush and washed with
purified water
 Dried with clean clothes and alcohol to prevent
rusting

6. SPATULA
 Horn made spatulas are used in
pharmaceuticals-
 First cleaned with a soft cloth
 Then washed with running tap water or kept for
hours in immersed water
 Finaly alcohal is used to wash it carefully
 Then it is wiped dry with clean cloaths
 It (horn made) never washed with hot water or
boiled in water

7. BOTTLES
 The bottles are kept in cold water for 6-7 hr
 Brushing with hard brush, by shaking and
brushing remove stains and dirt
 The wash with moderate warm water and rubb
with soft brush
 Then washed with purified water.
 Then some amount of alcohol poured in bottle
and wash them proeprly
 The expose the bottle to sun for drying purpose

8. CORCKS
 Corks first rubbed in running tap water then
with purified water
 Then kept to dry and after drying again rinsed
with dilute alcohal
 Then dry thoroughly at moderate temp under sun
ray

9. WOODEN INSTRUMENT
 Washed under running tap water and rubbed
thoroughly with hard brush
 Then washed with warm water and soft brush
 Lastly used purified water for wash
 It is kept under sun light