diff --git a/share/scripts/cacheCleanup.go b/share/scripts/cacheCleanup.go
new file mode 100644
index 00000000..291f77c7
--- /dev/null
+++ b/share/scripts/cacheCleanup.go
@@ -0,0 +1,52 @@
+package main
+
+// Remove invalid cache entries.
+// Cache entry is invalid, if it contains a special substring.
+
+import (
+	"context"
+	"log"
+	"strings"
+
+	"github.com/go-redis/redis"
+)
+
+var invalidEntrySubstr = "Unknown cheat sheet"
+
+func removeInvalidEntries() error {
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     "localhost:6379",
+		Password: "",
+		DB:       0,
+	})
+
+	ctx := context.Background()
+	allKeys, err := rdb.Keys(ctx, "*").Result()
+	if err != nil {
+		return err
+	}
+
+	var counter int
+	for _, key := range allKeys {
+		val, err := rdb.Get(ctx, key).Result()
+		if err != nil {
+			return err
+		}
+		if strings.Contains(val, invalidEntrySubstr) {
+			err = rdb.Del(ctx, key).Err()
+			if err != nil {
+				return err
+			}
+			counter++
+		}
+	}
+	log.Println("invalid entries removed:", counter)
+	return nil
+}
+
+func main() {
+	err := removeInvalidEntries()
+	if err != nil {
+		log.Println(err)
+	}
+}