How to reset bitcoin testnet

How to reset bitcoin testnet

I'm running a private bitcoin network and would like to reset the bitcoin blockchain data back to the genesis block.

I've tried deleting all the files in ~/.bitcoin/blocks and ~/.bitcoin/wallets but bitcoin-cli -testnet getblockchaininfo still shows existing blocks.

$ bitcoin-cli -testnet getblockchaininfo
{
  "chain": "test",
  "blocks": 10,
  "headers": 10,
  "bestblockhash": "000000008668c111d16fd895919969836292a61919c6150a0f9a1dd5cc41aa55",
  "difficulty": 1,
  "mediantime": 1526598651,
  "verificationprogress": 6.116528714283428e-07,
  "initialblockdownload": false,
  "chainwork": "0000000000000000000000000000000000000000000000000000000b000b000b",
  "size_on_disk": 2573,
  "pruned": false,
  "softforks": [
    {
      "id": "bip34",
      "version": 2,
      "reject": {
        "status": false
      }
    },
    {
      "id": "bip66",
      "version": 3,
      "reject": {
        "status": false
      }
    },
    {
      "id": "bip65",
      "version": 4,
      "reject": {
        "status": false
      }
    }
  ],
  "bip9_softforks": {
    "csv": {
      "status": "defined",
      "startTime": 1456790400,
      "timeout": 1493596800,
      "since": 0
    },
    "segwit": {
      "status": "defined",
      "startTime": 1462060800,
      "timeout": 1493596800,
      "since": 0
    }
  },
  "warnings": "This is a pre-release test build - use at your own risk - do not use for mining or merchant applications"
}
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