Had my A/C recharged a couple weeks ago. The shop pulled a vacuum on it for an hour and it held. The coldest it gets is about 40F, but sometimes it won't go below 60F. I haven't been able to correlate any certain driving behaviors such as city stop and go vs highway to this. Radiator and condenser are free of debris. I and thinking of spraying the evaporator (with evap in car) with coil cleaner. Any coil cleaner brands recommended? One with a hose would be best.