It's about time I service my oil boiler. It's a weil-mclain wtgo-3. I'm no expert, but I manage to change the oil filter, clean the strainer, and change the nozzel witout too much of a problem. The thing I can't stand is brushing between the fingers of all those sections. I last used a Mill Rose 1/2" x 1 tapered brush but still managed to get the handle stuck several times to the point of thinking it wasn't coming out. So, is there a better way than brushing to clean out the soot? If not, a better technique maybe?