An effective way to start is with an adware removal tool. These tools can detect and remove malicious apps and help protect your device from future threats. You should also check what apps you have installed on your device and delete any that look suspicious or unfamiliar. It's important to remember that many malicious programs tend to masquerade as legitimate ones, so be extra careful when downloading apps from external sources — only download official versions from the Google Play Store. Finally, make sure to clean up your browser by clearing out cookies, cached images, saved passwords, and autofill data on a regular basis. This will help to reduce the number of unwanted ads you see. For further information, read our guide on how to remove malware from your Android device.