Answer:
Activity modules (and usually integrations) and blocks can be deleted in two steps.
For activity modules, visit the Activities management page (Site Administration | Modules | Activities | Manage Activities). Click on Delete to remove all instances of the module in courses and any tables set up for the module.
For blocks, visit the Blocks management page (Site Administration | Modules | Blocks | Manage Blocks). Click on Delete to remove all instances of the block and any tables set up for the block module.
Explanation:
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