Combine green tomato, onion, green and red peppers and 1/4 cup salt, mix well, cover with a dish towel and let stand overnight(70-75 degrees).
Transfer to a colander to drain. Rinse w/cold water and drain thoroughly. Using hands squeese out liquid. Set aside.
Tie cloves, celery seed and cinn. stick in a cheese cloth bag.
In a pan combine vinegar, brown sugar, garlic, mustard, salt, ginger and spice bag.
Bring to a boil stirring to dissolve sugar.
Add drained tomato mix stir well and return to a boil, turn down to a gentle boil, stirring freq. until tomatoes are transparent, about 1 hour.
Ladle hot relish into hot jars leaving 1/2" headspace. Remove bubbles, wipe rim cap and water bath for 10 min. at a full rolling boil.