Great that you looked into the compatibility first. Many solvents can dissolve, or at least swell, parts of the machine.

The good thing is, solvent isn’t solvent. There are different kinds (polarities, etc.), and maybe something like alcohol might work.
Problem is, grease is hard to dissolve with those.

In the industry, you have special “laundry washing machines” (sort of) that work with hot solvent, e.g. benzyl alcohol, since you need movement and heat preferably to clean everything decently.
Even with a good solvent, degreasing with your washer alone won’t work as great.

I personally would go for an ultrasound bath. They tend to work more mechanically (phsically) instead of chemically, and with them, you can dissolve the dirt with soapy water pretty easily, without any volatile solvents or risks. You can get a decent one for 50 bucks starting price, or 100 if you want a bit better one.

I have no idea what a part washer is, but maybe consider using an ultrasonic cleaner.

You can then either load it with surfactants (e.g. SLS) in a water phase or with apolar solvents like cineol, terpentine or limonene, which have similar solving capabilities as diesel, but are bio based and not as flammable.

Using surfactants alone without ultrasound won’t work, but using solvents alone won’t keep the particles in phase, as they would just sink to the bottom.

If you tell me exactly how this washer looks like/ works and what exactly you wanna clean, I can help you more.

I think making an “usable” phone (especially one that is able to make calls, etc.) yourself is extremely hard to do, if not impossible.
Many “tinker”-phone startups/ devices, like PinePhone or Librem, who made the phones from scratch or mostly themselves afaik, had huge problems in the beginning with basic functions, like making calls.

There’s a project (mainly for kids and students) somewhere to make E-readers themselves, maybe you can start with that?
I’ll link it to you if I found it.
That might act as a base.

If you want a good phone that gives off DIY-vibes (modularity, repairability, etc.) but want something proper and modern, then check out Fairphone. Afaik, the FP4 also supports PostmarketOS and other mobile distros.

Remember to take everything I said with a huge grin of salt, since I’m not that well informed in that area of DIY- or Linux phones. A lot of what I said might be wrong, take it only as idea or starting point.

But if you really want to start this project, good luck. You’ll need it 🫠

Your best bet would be PVA (Poly vinyl alcohol), which is a water soluble plastic and usually the base of wood glue or water based paper glue.
Dilute it in warm water and soak your paper in it.

Starch is too stiff and crumbly for that use case.

I think you misunderstood the motive of this community.

Also, I don’t wanna be rude, but who cares? You could post your experience after a month or so in a sub that focuses on stuff like that, but we’re all here for life hacks and, you know, stuff YouShouldKnow 🙃