the crusty jar
Dissolve dried sourdough starter
Every starter jar ends up with a ring near the top that laughs at sponges. It comes off without scrubbing once you soak it in the right thing.
Why starter dries into a glassy film
Starter is flour and water, which makes it close to pure starch paste. As the water leaves, that paste shrinks tight against the glass and dries into a thin, hard, almost transparent layer.
It is the same chemistry bakers use as a glue on pastry. Very effective, which is the problem.
The jar method
- 1. Scrape usable starter or discard into a container or the bin. Not the sink.
- 2. Fill with warm water and add enzyme cleaner, going above the dried ring so the whole film is submerged.
- 3. Wait about 10 minutes, then swirl the jar to sweep loosened film off the walls.
- 4. Work the shoulder with a soft bottle brush, the narrow curve where the worst of it hides.
- 5. Rinse warm, bin any solids, and stand the jar upside down to dry.
How often the jar really needs a clean
Less often than the internet suggests. Scraping the walls down at each feed keeps the jar workable, and a little dried film does not harm the culture.
Swapping into a fresh jar, or giving the current one a full clean, every week or two is plenty. Do it when it bothers you or when the film starts hiding your rise marks.
Discard rules
- Works: Bin it, or compost it if your setup takes flour.
- Works: Or bake with it: crackers, pancakes, flatbread.
- Does not work: Never rinse discard down the drain. It swells and sets in pipes.
the shortcut
Or let the enzymes do it
After Dough is the enzyme cleaner this site keeps describing: amylase for the starch, protease for the gluten. One pump in warm water, about 10 minutes, and the bowl rinses clean.
Get After DoughQuestions about starter jars
How do I get dried starter off the shoulder of the jar?
Fill the jar with warm water and enzyme cleaner past the dried ring, wait about 10 minutes, then use a soft bottle brush on the narrow part where a cloth cannot reach. Rinse and bin any solids.
Do I need to clean my starter jar at every feed?
No. Scraping the sides down keeps things tidy day to day. A fresh jar swap or a full clean every week or two is plenty for a healthy starter.
Where should sourdough discard go?
In the bin, in the compost, or in a recipe. Never down the drain: discard is a flour paste that swells in water and can set into a plug in the pipe.
See also how to dissolve dough and how to dissolve hardened dough.