I like using special characters to show whitespace, is more clear. Even a map to toggle is a key feature, for a quick check.
You can find this features in an old vim script not updated since 2004:
Thanks to project vim-scripts and vundle you can come back to life this plugin
vim-scripts/cream-showinvisibles@github
Even better, my two cents on this is to add a configurable shortcut (instead of predefined F4)
so add this to ~/.vimrc
Plugin 'albfan/cream-invisibles'
let g:creamInvisibleShortCut = "<F5>" "for my F4 goto next error
install plugin on vim
:PluginInstall
and there you go