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Picture of How to clean a Mossberg 20 Gage Shotgun Pump
Here are the materials you will need to clean your gun; your shotgun, cloth, toothbrush, solvent, oil, various wood cleaning supplies, and a cleaning rod. 

Step 1: Step 1- Make sure your gun is unloaded and your safety is on

Picture of Step 1- Make sure your gun is unloaded and your safety is on
The first and most important step is to make sure your gun is fully unloaded and your reciever is opened. Also your safety should be on! This assures your safety and the safety of others.
 
Great job! Good to see a "girl" doing an ible on a firearm, too! Much KUDOS!!!