Spray on motorcycle chain lube, the kind that sprays on thin, foams and penetrates into all the crevices, then thickens so it won't be flung off. I like it because it gets into small places then thickens. Have used Castrol and Lucas.
Someone makes a wax based chain lube and that might be just the ticket. Thick lubes do attract grit and grunge. Anybody try the wax base chain lube ?
The spec sheet says it doesn't attract dirt and doesn't fling off...might be something to try.
Gary