I've been a bad boy. Let my Oklahoma Joe's go for a while. Have rust on inside and out of firebox. Some on CC. Taking it down to bare bones to redo. Have read tons of posts on cleaning, rust removal, paint etc. for outside of unit. My question is regarding the inside of the firebox and cooking chamber. Firebox had heavy rust inside so I am using wire wheel on drill to get it out. Have seen coating info from the likes of pro-15 and others that will remove/retard rust. But would that work on inside of firebox. Safe for cooking? And it sounds like no paint for inside of CC. Just clean good and season. I do have small spots of rust around inside edge of lid. Wondering if the rust retarder is ok for inside of CC?