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There are a few deglossing products available. I've used this one. You need to protect your lungs when you use it though.
https://www.decoratingdirect.co.uk/viewprod/k/KRUDKUTTER_GLOSS_OFF/
I would normally go with water based on top these days. I like an oil based eggshell finish but it's a pain to work with. Alkyd eggshell is a water based clean up as far as I know. I only mention it instead of acrylic eggshell as I've been introduced to it recently and it was easier to apply with a brush to a front door and to railings.
I am only recommending not sanding if you have flat 'clean' surfaces which a lot of modern furniture has.
Okay thank you, so no sanding? What's the sprayed liquid to degloss? And you wouldn't go water based on top then from what you're saying?