The insulating rings around each hotplate can be removed for cleaning. Ensure they are returned to their rightful place and the same position. There is usually a notch which faces the back of the AGA to help you.
The interior of the lids can be cleaned by leaving a kettle boiling for 5-10 minutes with the spout facing the inside of each lid. Use a soap-filled cleaning pad, dip it in warm water, and clean the inside of the lid, using circular motions. Wipe clean with a damp cloth.
The exterior of the lids and the handrail can be cleaned with a damp soapy cloth, wiped off with a wet cloth, and polished with a clean dry cloth.
The handrail brackets and side panels are painted so only use a soft soapy cloth, as using abrasive pads or products may scratch the paint off.