Place apples in a crockpot or roaster (200-250 degrees). In a medium bowl mix the sugar, cinnamon, cloves, and salt. Pour mixture over the apples and mix.
Cover and cook on high for 1 hour.
Reduce heat to low and cook 8-9 hours, stirring occasionally until the mixture is thickened and brown.
Uncover and continue cooking on low for 1 more hour. Stir with a whisk to get lumps out.
Spoon mixture into sterile jars. Refrigerate or freeze.