Seems like the best method is via walnut blast with maybe a metal adapter from 034
Are you using the Harbor Freight kit?

kit: $35
adapter: $50
walnut fine media: $25 per 25lb bag
I wonder how long one bag lasts and how many cars it can do
Also, if you decide to blast other things as a side project, such as cleaning up a metal part
how does that work?
I am more worried about getting the work area sandy and polluting the environment
It's one thing to use a blast cabinet (which I don't have)
but switching over to glass bead (if it's needed?) and then spraying that stuff all over the area and outside seems kind of sketchy
like what if a random animal walks by and licks it up off the ground
IDK if Harbor Freight is the cheapest place to obtain walnut media


looks like BMW even has a factory adapter, part number 81 29 2 208 037
Not sure if it works on other vehicles
Hopefully whatever tool is used has a good seal to the cylinder head and with the hole the spraygun goes into, so that media doesn't get all over the place in the engine bay

at slightly lower price, people also sell plastic ones, but IDK how many uses they last up to
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