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does anyone know of a cleaner, hopefully one that will not damage a rubber roof, that can get calcium build up of an air cooled condenser? we have a 15 ton unit that was installed by others way too close to a cooling tower. the unit ran like that for 5 years until we relocated out of harms way. at this point the damage has been done and there is this white film over everything, over the counter coil cleaners have little to know effect on getting this off. it is so bad that any day above 95 out both compressors will not stay online. any suggestions would be helpful. we are almost to the point of recommending the coil be replaced. thanks to all