How should carbon and heavy grease in an oven be removed?

Please verify the following points and require itemized written supplier responses:（commercial oven oven-grease-carbon） Use suitable degreaser to soften buildup, then use proper scrapers and cloths rather than sharp tools that damage the interior or fan. Heavy grease can cause smoke or flame, so schedule regular deep cleaning. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.