Should I use fixatives for pastel drawings and which works best?

One of the dilemmas of pastel paintings is that they're very dusty and smudge very easily. You would think that the solution is simple

Using Fixatives - Grumbacher Art

The premiere final fixative spray for charcoal, pastel, pencil drawings, and sketches. Prevents smudges and finger prints. Protects artworks,

Hard Final Spray Fixative

Fixative or No Fixative with Pastels - Blog

VARNISH VS. FIXATIVE: the Сomplete User's Guide

Tips for Framing Pastel or Charcoal Drawings - American Frame

Fixatives & varnishes: what you need to know to preserve your art – Veronica Winters Painting

Storing Pastel Artwork Safely

Latour Soft Pastel Spray Fixative 400ml Aerosol Can –, 44% OFF

To Spray or Not To Spraychalk pastels

Varnish vs. Fixatives - Should I Use Them? - Strathmore Artist Papers

Fixative spray for coloured pencils. Is it safe?