Wisconsin Administrative Code
Department of Agriculture, Trade and Consumer Protection
ATCP 55-89 - Food, Lodging, and Recreation Safety
Chapter ATCP 75 - Retail Food Establishments
Appendix - Wisconsin Food Code
Chapter 4 - Equipment, Utensils, and Linens
Part 4-6 - CLEANING OF EQUIPMENT AND UTENSILS
Subpart 4-602 - Frequency
Section 4-602.12 - Cooking and Baking Equipment

(A) The FOOD-CONTACT SURFACES of cooking and baking EQUIPMENT shall be cleaned at least every 24 hours. This section does not apply to hot oil cooking and filtering EQUIPMENT if it is cleaned as specified in Subparagraph 4-602.11 (D)(6).

(B) The cavities and door seals of microwave ovens shall be cleaned at least every 24 hours by using the manufacturer's recommended cleaning procedure.