diff --git a/CHANGELOG.md b/CHANGELOG.md
index 31b3a7c..9f5a32e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - [ ] Support multiple models for each target
 - [ ] Play button to start time dimension (not very useful?)
+- [ ] Optimize CSV generation (with some vectorization using numpy)
 
 ## 1.0.0
 
@@ -13,11 +14,12 @@
 - [x] Start/Stop datetime fields
 - [x] Retry CSV generation when it fails due to a bug in AMDA's API
 - [x] Remove duplicate NetCDFs from AMDA's API response
-- [ ] Optimize CSV generation (with some vectorization using numpy)
+- [ ] Add a version number somewhere
+- [ ] Move the visitors counter to the footer
 - [ ] Cache cleanup
-  - [ ] API at /cache/cleanup
+  - [x] API at /cache/clear
   - [ ] CRON statement to call it
-- [ ] Download raw data (as CSV) for current time interval and targets
+- [ ] Download raw data (tarball of CSV) for current time interval and targets
 - [ ] Same via SAMP
 - [ ] Credit the author of the pixel art planets
 - [ ] Set the log level to _error_ in production (see `web/run.py`)
diff --git a/web/run.py b/web/run.py
index 99386f2..b57466f 100755
--- a/web/run.py
+++ b/web/run.py
@@ -4,7 +4,7 @@ import StringIO
 from math import sqrt
 
 from os import listdir, environ, remove as removefile
-from os.path import isfile, join, abspath, dirname
+from os.path import isfile, join, abspath, dirname, isdir
 
 import csv
 import json
@@ -368,6 +368,34 @@ def generate_csv_file_if_needed(target_config, started_at, stopped_at):
             abort(500, "Failed creating CSV '%s' : %s" % (filename, e))
 
 
+def remove_files_created_before(date, in_directory):
+    """
+    Will throw if something horrible happens, like invalid parameters.
+    :param date: datetime object
+    :param in_directory:
+    :return:
+    """
+    import os
+    import time
+
+    secs = time.mktime(date.timetuple())
+
+    if not isdir(in_directory):
+        raise ValueError("Directory to clean '%s' does not exist.")
+
+    removed_files = []
+    for file_name in os.listdir(in_directory):
+        file_path = os.path.join(in_directory, file_name)
+        if not os.path.isfile(file_path):
+            continue
+        t = os.stat(file_path)
+        if t.st_ctime < secs:
+            removed_files.append(file_path)
+            os.remove(file_path)
+
+    return removed_files
+
+
 def increment_hit_counter():
     hit_count_path = get_path("../VISITS")
 
@@ -494,6 +522,20 @@ def download_targets_tarball(targets, started_at, stopped_at):
 
     return send_from_directory(get_path("../cache/"), gzip_filename)
 
+
+# API #########################################################################
+
+@app.route("/cache/clear")
+def cache_clear():
+    """
+    Removes all files from the cache that are older than roughly one month.
+    """
+    a_month_ago = datetime.datetime.now() - datetime.timedelta(days=32)
+    cache_dir = get_path('../cache')
+    removed_files = remove_files_created_before(a_month_ago, cache_dir)
+    return "Cache cleared! Removed %d old file(s)." % len(removed_files)
+
+
 # DEV TOOLS ###################################################################
 
 # @app.route("/inspect")
--
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