From IPFS: You don't. As long as a connected node is hosting the file, it will be available to other peers. For a file where a single host is "pinning" a file (

From IPFS: You don't. As long as a connected node is hosting the file, it will be available to other peers. For a file where a single host is "pinning" a file (= purposfully hosting the file), it will fade out organically once it leaves the caches of all the nodes that accessed it once. From IPNS: You point the IPNS entry to something nonsensical and then by default it will be gone once the TTL of the old IPNS entry is reached (kind of like DNS).