Can you fix moldy gutters? 

The traditional DIY recommendation for mold is to use solutions like bleach or mildew spray. However, this can be dangerous and it does not tackle the root of the problem. For the best results, you should consider working with a professional mold removal company.  

Keep in mind that mold on your gutters could indicate mold on the side of your home or inside structures like the roof or attic. Make sure to have your home inspected if you notice mold anywhere.