Who's right? It's not that the notion of burning pepper is complete nonsense—in theory, yes, black pepper could burn. The problem with peppering midway through cooking is that the pepper granules might not stick to the meat. You could pass a pepper grinder at the table, but if you're cooking outside and eating in an informal style, this may not be feasible.
Brush your grill grates after every use (inspect for wire brush bristles before cooking), and thoroughly clean them every couple of months, depending on grill usage. And twice a year, you should give your grill a thorough cleaning, which helps it cook better and last longer. The basic process is the same for gas or charcoal grills; charcoal grills just have fewer parts.
Outdoor grilling is a great way to get together with family and friends and enjoy tasty food. However, the outdoor fun is only possible with a grill that is cleaned and maintained throughout the year. There are a few simple cleaning steps that you can do after every time you grill, along with deeper, semi-annual cleaning steps to keep your grill working its best for years to come. An outdoor grill that is kept clean and maintained will stay in good working order and will ensure that the food you cook on it always tastes great.