A quick question to fellow CCR owners. Does anyone perform a dry roast (bean-less) as a cleaning process? I have now done 50+ roasts and noticed the sight glass is beginning to get that coffee oil colour on it. Easy process to clean the glass but as for the drum and interior....? I am prepared to do an extensive pull down/overhaul soon as the roaster is almost a year old. But wonder if there is a cleaning recommendation for this roaster as I don't recall reading anything about it in the limited documentation that was available when purchased.