I got a short piece of clear vinyl tubing that would fit into the drain opening. I bought an adapter for that tubing to a garden hose. The tubing is attached to the adapter which then attaches to trigger sprayer that's attached to the hose. I turn on the hose, stick the tubing down the drain, pull the trigger and blast any debris down and out the drain.
There's a small chance that this will clog the drain further but in several years this hasn't happened.
This same setup happens to fit my holding tank vent so if I suspect that's clogged I can clear it as well.
It's best, of course, to clean the channel leading to the drains often enough that they don't clog in the first place.
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