# The Milk (Special Designation) Regulations 1989, Paragraph 5: Care of apparatus


(1) New glassware shall be cleaned and free from contamination from substances which may interfere with the test.
(2) After use, each test tube shall be emptied, rinsed in water, well washed in hot water containing soda, rinsed in warm water, rinsed in distilled or de-ionised water and finally dried.
(3) If after treatment in accordance with sub-paragraph (2) above a test tube does not appear to be clean, the treatment shall be repeated with the addition that after being rinsed in warm water it shall be soaked in 50 per cent. commercial hydrochloric acid and then rinsed again in warm water before being rinsed in distilled or de-ionised water and finally dried.
(4) Glassware used for the test shall not be used for any other purpose and shall be kept apart from all other apparatus in the laboratory.

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Source: https://www.legislation.gov.uk/uksi/1989/2383/schedule/5/part/IV/paragraph/5 (the official version)
Page: https://openlegislation.uk/milk-special-designation-regulations-1989/schedule-5/part-IV/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.