I just cleaned the flyash out of my horizontal pipes for the second time this season. With the T's in place, it takes all of about 30 seconds. As for spring maintenace, I used to do the whole baking soda LPS-3 treatment. I was tough to do because of the way the 8 heat exchanger tubes run through the inside of the boiler. You can never get to everywhere. Last year I did this. I vacuumed out the inside and disconnected and cleaned the vent pipe. I removed the stoker, disassembled and cleaned it. As for the actual boiler, I capped the vent on the boiler and sealed off the opening for the stoker. Stuck a drop light inside and let it run all summer. This fall the boiler looked just like it did when I shut it down. No corrosion. I'm sold on the drop light now.