That home brew paint should come off very easy. Even soap and hot water and a scotch brite pad will take it off.
Sand or shot blasting would destroy tins. Ice blasting would probably leave dents in that thin metal.
I bought a blaster and a box of walnut shell chips. Useless. I suspect my air home compressor wasn't powerful enough.
I've been using various non toxic orange type strippers with pretty good results. Very useful for small items. Not so great for full kitchen walls. There are some that you apply then wrap with plastic to keep the stripper from drying out. Others don't need the plastic. The claims of removing up to 7 layers of paint in 1 pass are bogus. A small tub will cost far less than any blasting service.
Kleen Strip with MTBE (the good stuff) is really hard to find anywhere anymore. Their less toxic version isn't so great.
Some Trek bikes are nearly impossible. I swear the finish is tougher than the aluminum frames. I've given up trying to strip those frames. Impervious to all chemicals. the rotostripper took chunks of metal out of the aluminum.
I used to use a ROTO-STRIPPER, as seen on TV. Fits in an electric drill so it only spins as fast as your drill goes. There are cheap knock offs that are prone to throwing wires so you have to very careful to hold it 90 degrees away from your head. Does a decent job on hard steel parts. Will go through tins. Won't get in to corners like most bike frames have. Will gouge mild steel. Will rip wood to shreds depending on the gauge of the wires.
Sanding. Not talking about old sheets of woodworking sand paper. Strips of emery cloth can take paint off pretty quick, including in tight corners. Not very good for flat surfaces. I recently bought a tiny hand held belt sander (1/2" wide belt) that's almost too aggressive.
