Fowler's Household Helps (1916)

"In order to get satisfactory and economical service and a long life, any range or mechanical device must be kept clean. This applies to the gas range as well, and we therefore wish to
emphasize that the little attention required is very much worth while. Clean the top, the ovens and removable drip pan frequently. Clean broiler griddle and pan _every_ time it is used. If any burner holes become clogged, clean them out with a piece of wire or a hairpin..."