diff --git a/app/models/user.rb b/app/models/user.rb
index a0a9d5f..04e0bec 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -16,6 +16,9 @@ class User < ActiveRecord::Base
 
   after_invitation_accepted :accept_invite
 
+  scope :guests, -> { where(first_name: 'guest') }
+  scope :stale_guests, -> { guests.where('created_at < ?', 1.week.ago) }
+
   def area_code
     self.phone ? self.phone.slice(0,3) : nil
   end
diff --git a/lib/tasks/destroy_stale_guest_users.rake b/lib/tasks/destroy_stale_guest_users.rake
new file mode 100644
index 0000000..54d11c7
--- /dev/null
+++ b/lib/tasks/destroy_stale_guest_users.rake
@@ -0,0 +1,3 @@
+task destroy_stale_guest_users: :environment do
+  User.stale_guests.destroy_all
+end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 257ea4f..916879a 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -107,4 +107,24 @@
       expect(user.most_recent_bills(2)).to be_a(Array)
     end
   end
+
+  describe '.guests' do
+    let!(:guest) { create :user, first_name: 'guest' }
+    let!(:not_guest) { create :user, first_name: 'not guest' }
+    subject { User.guests }
+
+    it { is_expected.to include(guest) }
+    it { is_expected.not_to include(not_guest) }
+  end
+
+  describe '.stale_guests' do
+    let!(:stale_guest) { create :user, first_name: 'guest', created_at: 2.weeks.ago }
+    let!(:not_stale) { create :user, first_name: 'guest' }
+    let!(:not_guest) { create :user, first_name: 'not guest', created_at: 2.weeks.ago }
+    subject { User.stale_guests }
+
+    it { is_expected.to include(stale_guest) }
+    it { is_expected.not_to include(not_stale) }
+    it { is_expected.not_to include(not_guest) }
+  end
 end