It doesn’t have to be complicated and you don’t need an ultrasonic cleaner to remove lube from a chain. Put some mineral spirits in a can, add the chain and swish around for a minute. Pull the chain, dry with a paper towel and see if it feels clean. If there is still some residue repeat with clean fluid. Save the old fluid for next time in a glass jar. Any contaminants will sink to the bottom of the jar. If there’s a little oil left on the chain it will mix with the hot wax, another petroleum product.