Once you’ve located the downloads folder using any of the methods I’ve listed for you above, deleting your downloads is a bit easier. In your file manager app (whichever you may be using) you can press down on the file you want to delete. Options will then appear, including one that will allow you to delete the said file. Holding down on a specific file will also trigger Android’s multiple selection process. This is helpful if you want to delete multiple files. Just make sure you select all the files you want to delete from the folder and then hit the Delete icon up top.