Ranger some people build their own sonic cleaners say using an old orbital sander attached to the bottom of a tub. Plenty of you tube vids on that. A proper one has vibration with a heater element and a bought solution. Or you can make your own solution with white vinegar soap and water. Gazza just threw the combined carbs in with all the easily removable bits (bowls caps jets but not all jets) he was quite happy with the result as it removed all the varnish of old fuel but didn't clean the outside bodies up like water, soda blasting would. I'm no expert just views on a mate's experience. With CEM google their web site, more expensive than super cheaps super cheap but a rule I learnt in Europe is you only get what you pay for. Cheers john.