We have a ultrasonic cleaner. Amazing what this thing can clean. Carbs come out like new. My friend had a frozen outside rear view mirror soaked it in WD for a month with no luck at all. We put it in the sonic cleaner for 20 min. it now works like new. Every part that goes back in a motor goes through the sonic cleaner. I couldn't tell you how many Lawn mower carbs we do.