What's the best way of cleaning large numbers of seeds and preparing them for storage?

I am not sure how large your quantity is... I simply wash them by hands with dish soap, dry on paper towel overnight, pack in zip-locks with Captain powder fungicide.

Good luck!

Below is an old post (2008) by Dr. Malcolm Manners about storing citrus seeds.

...."Seeds of most rootstock varieties can be stored for quite a long period of time. They're removed from the fruit, washed, surface dried (over night or 2 days), sealed in plastic bags, and refrigerated (not frozen). They should keep for at least a year, possibly substantially more, under those conditions."....

I presume that this method pertains to most all varieties of citrus seed, not just rootstock seed. The reason that rootstock seed is refered here, is because only the seed of citrus varieties that are used for rootstock are normally only the ones that most people ever bother to store. Millet

I've cleaned several gallons of trifoliate seed in the last few years. I use the following method:

1. Put the fruit in a tied up trash bag and store outside until they turn to mush. I leave them outside like this in the winter for months and clean them in February or when it warms up.

2. Put some rubber gloves on. The trifoliate gunk sticks to finger nails like tobacco wax and will not come off with soap and water.

3. Get a small tub or shallow bucket and run the garden hose in the bucket/tub. When it starts overflowing with water, mash up a handful of fruit at the time while holding them under the water. The seeds will sink to the bottom and the peel, pulp, and segment skins will float out over the sides of the tub.

4. Repeat step 3 with handfuls of fruit at the time.

*Don't turn the hose on high or it will wash the seeds out too. They barely sink.

*When you get all the seeds out you have to keep siring the seeds and pouring the little pieces of segment skins out to get them really clean.

*You can cut the fruit and squeeze the insides out under the water, but it's way faster if the fruit are soggy because you don't have to cut each one.

Thanks for the advice, guys.