On Chrome:

  • Tap the three dots on the upper right-hand corner of the app
  • Select privacy and security
  • Tap Clear Browsing Data
  • Make sure that all boxes are checked, then tap clear all browsing data at the bottom right-hand corner

On Firefox:

  • Tap the three dots on the upper right-hand corner of the app
  • Tap Delete browsing data
  • Make sure that all but the bottom box is checked, and tap delete browsing data just below. Make sure that the last box isn't checked before you do. Or your downloads will be deleted along with your cache.

On other browsers it should be similar steps, I covered the most common of the two browsers in this blog.