The Rodent Guide
Soak a handful of common cotton balls in white vinegar and leave then in areas where you have noticed rat activity.
This is even easier! Pour a cup full of white vinegar and leave it in an area where you have noticed rat activity.
Make up a 50/50 mix of white vinegar and water. Add in a teaspoon full of salt too. Use this to spray and clean up after the rats!
When using anti-bacterial sprays, or other equipment, you can add white vinegar to these products to add in a natural rat repellent.
This is an aggressive tactic, but one that you should absolutely do if you find a rat nest in your home!