Ok, some fret about cleaning out tires annually. Some fret about the extra weight of sealant. I normally don’t clean out tires.
This tire dried up over the winter so my hand was forced. The grand total of three years of sealant is 44 grams. And I’m a heavy sealant user. No way am I trying to get by with 20 or 30mls to save weight. I start with 90mls on a new tire because it dries out faster than normal top ups. I top up with 60mls as needed - maybe once a month during the riding season. (The plastic bag didn’t even register 1g.)