Deck- Old paint , off , new stain on ? How?

You'll have to strip it. Use citristrip and do it in sections. Citristrip won't harm any of your landscaping

I would not use a liquid paint remover on a deck because the chemicals will sink into the deck wood and may effect the stain you apply. Sweep/power wash the deck. Sand the whole deck to get off the paint and smooth any roughness time has caused. Choose a good brand of deck stain, and understand that the color may be different, depending on the wood already in place. Use a deck stain that is self-sealing, or apply a sealer that is water-resistant, probably more than one layer. Also seal between the boards if there are any gaps. If you can get underneath the deck, seal under the deck, too. I bet your deck will be stunning when you finish. Please take lots of photos, and Post the story on Hometalk. Best wishes ☺️

Use Paint stripper if Paint with Brush and Scraper. Brush or spray on new stain.

How to Strip Old Paint Off of Decks | Home Guides | SF Gate

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Old deck paint will occasionally come off with a scraper and a strong blast of water, ... but a chemical stripper often is necessary to remove all of the stubborn paint ... and fill gouges or holes with exterior wood filler prior to painting or staining.

How to Power Wash an Exterior Deck to Remove Paint | Home Guides ...

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... coat of paint, you'll have to remove all of the chipped, peeling and weathered old paint to wipe the ... ... As the paint stripper does its work, the paint will start to lift or bubble up. ... Repeat Steps 3 to 5 untilyou have removed all of the paint from the deck. Wait at least 48 hours before staining and sealing orpainting the deck.

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We had to manually use a palm sander and power wash to get our patchy poorly applied ( handyman) finish off, then recoat the deck with the same color stain— at our previous residence.

A lot of sanding, power washing and cleaning is the only way to remove any old paint on a deck and even at that you may not be able to get it all off. If you decide to re-stain do not use a latex paint with the primer as it will not stick and will eventually peel. The pros at "This Old House" recommend a semi transparent stain.