I really wouldn't expect coil gunk after 3 days, especially when they're soaked almost daily in hot water for 5+ minutes. Maybe you're right though.
All depends on impurities in the juice.
I have one juice that clogs up after going through 3-4.5 ml. I have another juice I can go 15-17 ml before they gunk up.
The OP needs to re wick and dry burn the coils if he can.