Retired A/C mechanic.
Don't put bleach down a PVC drain pipe. Just use Dawn dish soap.
Other than pressure wash condenser, change filter, vacuum coil, return grills and put compound gauges on the system to make sure you have proper pressures on both high and low side of unit.
Detecting a freon leak early is better than discovering it late when it becomes a huge job or possibly need to replace the whole unit.
Also when buying a new unit be mindful of the efficiency rating, there's new efficiency laws so don't be fooled into an outdated unit.
Munn's is the best but currently has an August/September waiting list.
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