Get a turkey baster and an empty plastic water bottle. Break the bead on the the mounted tire and hang the tire/rim from a workstand (or whatever). Use the turkey baster to suck the sealant out and shoot it into the bottle. Use a paper towel to wipe the inside of the mounted tire to remove the remaining sealant. Unmount the tire and set aside. Mount the new tire most of the way, just leave 1/4 of the bead unseated and dump the sealant from the bottle in. Top off with fresh sealant as needed. Complete mounting the bead, set it with the air compressor, insert valve core, and pump up. Ride.
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