I think if you are looking for 1 product for occasional use, you are asking for a "all in one" product.. something that can polish light scratches, clean and protect in one..
Klasse All In One comes to mind and and also Werkstatt Prime. Both are acrylic-based for longer lasting protection, easy to use one step products and very economical. I use Werkstatt Prime as my go to one-step. They are designed for hand use. Of course you will get better results with separate products but for ease of use, these are great.