diff --git a/validator_manager/test_vectors/generate.py b/validator_manager/test_vectors/generate.py
index 45f73fb7b4..722414de73 100644
--- a/validator_manager/test_vectors/generate.py
+++ b/validator_manager/test_vectors/generate.py
@@ -1,13 +1,22 @@
+# This script uses the `ethereum/staking-deposit-cli` tool to generate
+# deposit data files which are then used for testing by Lighthouse.
+#
+# To generate vectors, simply run this Python script:
+#
+# `python generate.py`
+#
 import os
 import sys
 import shutil
 import subprocess
 from subprocess import Popen, PIPE, STDOUT
 
+
 NUM_VALIDATORS=3
 TEST_MNEMONIC = "test test test test test test test test test test test waste"
 WALLET_NAME="test_wallet"
 
+
 tmp_dir = os.path.join(".", "tmp")
 mnemonic_path = os.path.join(tmp_dir, "mnemonic.txt")
 sdc_dir = os.path.join(tmp_dir, "sdc")
@@ -34,6 +43,13 @@ def cleanup():
     if os.path.exists(tmp_dir):
         shutil.rmtree(tmp_dir)
 
+    # Remove all the keystores since we don't use them in testing.
+    if os.path.exists(vectors_dir):
+        for root, dirs, files in os.walk(vectors_dir):
+            for file in files:
+                if file.startswith("keystore"):
+                    os.remove(os.path.join(root, file))
+
 
 def setup_sdc():
     result = subprocess.run([
@@ -58,6 +74,7 @@ def setup_sdc():
     ], cwd=sdc_git_dir)
     assert(result.returncode == 0)
 
+
 def sdc_generate(network, first_index, count, eth1_withdrawal_address=None):
     if eth1_withdrawal_address is not None:
         eth1_flags = ['--eth1_withdrawal_address', eth1_withdrawal_address]
@@ -90,7 +107,6 @@ def sdc_generate(network, first_index, count, eth1_withdrawal_address=None):
     process.wait()
 
 
-
 def test_network(network):
     sdc_generate(network, first_index=0, count=1)
     sdc_generate(network, first_index=0, count=2)