How to smoothly remove Masonite board along the edges of the ceiling?

[ZeroKnowledge]

Encountering this everywhere on the ceiling of the rooms I’m renovating, it's either thin masonite boards or thicker wood fiber boards, and they all have in common that they were nailed before similar ugly boards were put on the walls.

Removing these boards from the ceiling is very easy, except just along the edges where they, so to speak, go in above the walls, which leaves a couple of cm of the mess left to try to get out when tearing down the ceiling. A handsaw is not suitable. A knife is tedious... any tips on good tool(s)?

 

[Düsseldorff]

Fein with knife blade

 

[Plupp 282191]

Multi saw.

 

[ZeroKnowledge]

Multisåg.

Thanks for the response, but do you possibly have any tips on a manual tool? I'm thinking of a small rigid saw that doesn't bend, but I don't even know if there's anything similar available in hardware stores.. I do these things so rarely that an expensive tool is somewhat unjustified for me!

 

[TheGame]

Thanks for the response, but do you reasonably have any tips on a manual tool? I'm thinking of something like a small stiff saw that doesn't bend but I don't even know if there is anything like that available in hardware stores... I rarely do these things, so an expensive tool is somewhat unjustified for me!

A multi-tool is a tool you will find useful many times so it's worth getting for this job.

 

[VidarH]

If you want a small manual tool for that, I would probably say that a Japanese saw/pull saw/urtagssåg is best? I got myself a small neat one about 20 years ago for fine sawing, and it was a bit of a revelation in woodworking. But as everyone else says, a multi-tool is faster and easier. However, it is the same tool as a Japanese saw, just powered...
The one I got was this one, by the way:
https://www.clasohlson.com/se/Urtagssåg-Gyokucho-Razorsaw/p/Pr307169000

 

[Mazen]

A backsaw is stable and provides fine cuts.
https://www.jula.se/catalog/verktyg-och-maskiner/handverktyg/sagar/ryggsagar/ryggsag-120007/