Wasn't really able to load my old stove that well but now that I have a new one I can pack it N/S to the gills for an overnight burn which is great, but...the coals from the ends of the logs tend to fall off and end up right up on the glass - I'm thinking I can just leave them be to burn down into ash, or is that not safe/good for the glass? Not talking a massive pileup, just a few chunks.