ᐅ Adhering Vinyl Flooring over Tiles: Floor Preparation

Hi,
I’ve already glued vinyl flooring onto the screed/self-leveling compound in the kitchen.
Now, the vinyl is also going to be glued onto the tiles in the living area. These are ceramic tiles (not smooth).
I’m not entirely sure how to properly prepare the tiles for the primer and leveling compound. Should I clean them with a machine and/or use a degreaser? Or do I need to sand them down completely?
It’s clear that enough leveling compound needs to be applied so the grout lines no longer show. The build-up height is not really an issue.

Many thanks

There are primers available that contain fine quartz sand for this purpose.