Refleks 36MI Chimney Cleaner. To Use: Turn stove to low setting, put in 1 single cleaning tablet so that it falls into internal base of burner pot, leave on low heat for 30 mins. After 30 min. stove can be turned up. As long as the flame within the stove is green-blue color the tablet is working, sometimes even days later. On a stove that is running 24/7, a cleaning tablet is recommend every 14 days. Sold 8 bars per box.