Glass/metal, shouldn't make a difference, you just don't want plastic because it picks up little scratches that keep moisture. I usually wash my bowl in hot soapy water then rinse with freshly boiled water from the kettle then air dry. If there's any water and I'm in a hurry I'll use paper towel as teatowels no matter how well you wash them have bits of grease and stuff that kill pav.

Berry Pavlova Recipe - Taste.com.au - this is the recipe I use, which works perfectly for me.