I dont have personal opinions, but I can suggest a few popular and effective stain removers for Nano Stone countertops:

1. Granite Gold Daily Cleaner: This cleaner is specifically formulated for use on natural stone surfaces like Nano Stone countertops. It can remove tough stains and leave the surface looking shiny and clean.

2. Stone Care International Stain Remover: This stain remover is designed to work on all types of natural stone surfaces, including Nano Stone. It can effectively remove grease, oil, and other stains without damaging the surface.

3. Weiman Granite & Stone Stain Remover: Weiman makes a range of cleaning products for stone surfaces, and their stain remover is a popular choice for Nano Stone countertops. It can remove even the toughest stains, including wine, coffee, and oil.

Remember to always do a spot test when using any new product on your Nano Stone countertop, and follow the manufacturers instructions carefully.